https://www.reddit.com/r/Steam/comments/5skfg4/warning_regarding_a_steam_profile_related_exploit/

Wow, another exploit, how unexpected

Currently, there is a risk (i.e. phishing, malicious script execution, etc.) involved when viewing or simply opening PROFILE pages of other steam users (both desktop and mobile versions). I would advise against viewing suspicious profiles until further notice and disable JavaScript in your browser options. Do NOT click suspicious (real) steam profile links and Disable JavaScript on Browser. Appropriate information has been forward to Valve and this issue should be resolved soon, sorry for any inconvenience.
Anyone (with knowledge of the exploit) who uses or abuses it FOR ANY REASON will RISK RECEIVING A COMMUNITY BAN. If you find any such profile that you can't report (as in literally cannot use the report button), please PM them to me.
Keep in mind that any discussion on any exploit method is NOT allowed here and will result in a ban without warning. This post is intentionally vague, and will be kept that way due to the nature of this exploit.
And to make it VERY clear: do NOT post profile links on this sub (temporarily), do NOT post proof of concepts (we have the repro steps and passed them on), do NOT post anything relevant that might provide information on how to do this exploit (incl. youtube links). This post is your warning.
TO THOSE POSSIBLY AFFECTED:
Change your Steam Account password, enable Mobile Authenticator if it's not on already (otherwise deauthorize Steam Guard on all systems from settings) then restart your router/change IP. You might want to also consider scanning your system with a malware scanner/anti-virus.


TL;DR

Currently, there is a risk (i.e. phishing, malicious script execution, etc.) involved when viewing or simply opening PROFILE pages of other steam users as well as your OWN ACTIVITY FEED (both desktop and mobile versions on all browsers).


update:

Valve have disabled Guide Showcases which means noone else can attempt this exploit. Now we just wait for them to clean up the profiles that have already abused this.


update 2:

Steam Profiles are safe to visit now.

Activity Feed might still be affected


update 3:

Fixed

7 years ago*

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Bump!
I think you should put [PSA] or something like that

7 years ago
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what is psa ?
prostate-specific antigen ?

7 years ago
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"Publice Service Announcement"
http://www.urbandictionary.com/define.php?term=psa

It doesn't have "PSA" in the title before, that's why I'm telling OP to do it.. :3


Other PSA thread on SG

7 years ago
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i googled it but still thx for serious answer :)

7 years ago
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I liked your definition, better. P

7 years ago
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soooo, we need more PSA, and maybe some tits to balance it
will You Support me on this one ?

7 years ago
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Oh, nice to know, for some reason I always though it means Please Stay Alert, which in the end has a similar meaning/effect I guess.

7 years ago
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Ohh - one is learning every day. Thank you.

7 years ago
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Play Station Andromeda

7 years ago
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whitelisted for "prostate-specific antigen" lol

7 years ago
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it stands for please stop answering

7 years ago
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police spanking adults ?
are you a dirty cop ?
are you a bad girl ?

7 years ago
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Oh, I was just about to create similar thread but then noticed this. Good I didn't double it.
Thanks for the info and let's hope this exploit will get fixed very soon...

7 years ago
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Was just about to make this thread. :p
bump

7 years ago
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Bump, it deserves attention

7 years ago
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What the.....! I am amazed.

7 years ago
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7 years ago
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This is bananas... =\

7 years ago
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Did you just say... B A N A N A ?

View attached image.
7 years ago
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You asked for it

7 years ago
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Oh, it is on, now. Throws down gauntlet.

7 years ago
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ouch, what is this?
got a friend request right yesterday from an unknown profile and obviously went to check why.
didn't accept and this morning the request was gone :\

7 years ago
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D:

7 years ago
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same here, but the request stayed. Just now declined it. What the fuck, valve.

7 years ago
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7 years ago
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I wouldn't count on it.

7 years ago
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I don't think so, if you really need to open a profile at least use a no-script extension

7 years ago
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I don't even get it. o.O Even if you check your own profile on a browser, you may get affected? o.O Or there are some specific malicious links that they'll send you and you'll get affected by clicking on them? Someone explain. :/

7 years ago
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i'm with Shamrock.
those smart CS guys. meh

7 years ago
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I can't understand anything of what they're saying. ;_;

7 years ago
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Of what I understood reading the Reddit thread, it probably redirects you somewhere else when clicking on the profiles.

7 years ago
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So, it redirects you on a fake site, identical to steam? So, you'll only get affected by clicking on a steam link? Not by checking your own steam profile, a friend's steam profile, etc? Only these specific malicious links will affect you?

7 years ago
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You click on a real steam link and it redirects you to an identical website. There are no malicious links (to my understanding, if I am wrong please someone correct me).

7 years ago
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So, it's only about giving your name and password to a fake site? That kind of link?

7 years ago
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So it seems. The problem is that you are on a legit URL and you get redirected by clicking on that legit URL's content. I personally wouldn't suspect a thing, I would think that it is Steam derping once more (as it usually does).

7 years ago
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It's still a really old trick. I mean, giving someone a link of a fake site in order to give his info, is a really old scamming trick. So, I shouldn't be afraid if I didn't click on anything? :/ Because, in the other comments, they're saying otherwise. :(

7 years ago
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Φίλος πρέπει ειλικρινά να μάθεις καλύτερα Αγγλικά, θα σε βοηθήσει. Δεν σου δίνει κανείς κανένα Link. Μπαίνεις στο profile του φίλου σου από τον Browser και αν είναι affected το profile του, αρχίζει και τρέχει ένα Javascript. Το script αυτό σε πάει αυτόματα σε ένα άλλο phishing site που σε ζητάει να κάνεις Login. Το πρόβλημα είναι ότι είσαι στην ΑΥΘΕΝΤΙΚΗ ιστοσελίδα του Steam, και αυτό αυτόματα σε καθοδηγεί σε μια άλλη ψεύτικη.

Πραγματικά ελπίζω να κατάλαβες τώρα.

7 years ago
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Ναι, το κατάλαβα και ξέρω ήδη καλά αγγλικά. Είτε σου δίνουν κάποιοι ένα link ενός affected profile είτε το κοιτάς από μόνος σου και σου κάνει redirect σε fake site. Το κατάλαβα και, αν παρατηρήσεις, το'χω γράψει και στον Sighery. Το θέμα είναι ότι, το να δίνεις τα στοιχεία σου σε ένα fake site, ακόμη και αν γίνεται μέσω ενός legit link, είναι παμπάλαιο scamming κόλπο.

7 years ago
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Το θέμα δεν είναι το ότι δίνεις τα στοιχεία του, αλλά το ότι κάποιος μπόρεσε να κάνει inject javascripts στο Steam profile. Το γεγονός ότι δεν μπορεί να κάνει κάτι άλλο με αυτό (αυτόματα trades κλπ.) είναι λόγο κάποιον περιορισμών του Steam. Το όλο κόλπο δεν είναι ότι σε κάνει redirect σε phishing sites, αλλά το ότι σε κάνει redirect.

Νομίζω παρόμοιο ήταν και εκείνο που σε έκανε redirect σε random Steam account's και μπορούσες να δεις τα στοιχεία τους.

7 years ago
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Λένε ότι μπορεί να αγοράσει από μόνο του και πράγματα από το steam market. Και αν έχω πάθει ήδη αυτήν τη μαλακία, πώς μπορώ να το ξέρω (προφανώς θα το'ξερα ήδη αν είχαν αγοράσει πράγματα από το λογαριασμό μου); Επειδή χρησιμοποιώ το steam από browser ουκ ολίγες φορές.

7 years ago
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Επειδή είσαι ήδη συνδεδεμένος στο Steam από τον browser σου, ναι θεωρητικά θα μπορούσε να αγοράσει από μόνο του (αν σου έκανε inject το script). Ρεαλιστικά μιλώντας, δεν ξέρω κατά πόσο αυτό γίνεται. Θα έλεγα εξαρτάται από τις ικανότητες του coder.

Θα σε συμβούλευα απλά να μην κάνεις browsing και να κάνεις Logout από το Browser σου, για κάθε ενδεχόμενο.

7 years ago*
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Έκανα disconnect το steam από τον browser. Απλά, όπως είπα, πώς μπορώ να ξέρω ότι δε με έχει επηρεάσει; Αν το διορθώσουνε το πρόβλημα, ακόμα και αν είχα επηρεαστεί, θα είμαι πια ασφαλής;

7 years ago
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Επειδή δεν ξέρω πολλά από coding, δεν μπορώ να σου απαντήσω στο πως μπορείς να είσαι σίγουρος ότι δεν επηρεάστηκες. Αν το διορθώσουν, λογικά θα είσαι ασφαλής πια. Αλλά όπως είπα, δεν γνωρίζω.

7 years ago
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Viewing your own profile should be fine from what I get from it.

Just don't go anywhere else. Avoid checking groups as well.

But I guess they're being too vague. They're making it sound like you could even infect a profile yourself, with a comment or so. Or like a game store page with a review. In that case if you have a public comment section not even your profile would be safe.

So unless there is more info about it I would avoid everything. :p

7 years ago
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So, just don't do anything on browser related to steam, only through steam app?

7 years ago
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It depends. I don't know what's wrong atm, but if your comment wall is set to private your profile is probably safe

7 years ago
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Just like everyone, I have my comment wall available only for friends.

7 years ago
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Me too. I hope this is enough or safer

7 years ago
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Some explanation from a comment in the thread:

With the right know-how a malicious user could do these actions for example, and you only need to view a Steam Profile:

Redirect you to any non-steam page, for example a phishing login page. From a user perspective it is you going to a legitimate Steam profile, then you see a login page. Seems legit right? Pop in your info. You didn't click anything suss so it's no big deal.

Utilize scripting to use your Steam Market funds on any item the malicious user chooses, you wouldn't even need to confirm anything as you're on a valid login session.

Manipulate elements on the page as they see fit.

Also

A user can still insert remote CSS to make their profile appear to be something it's not - like a Valve employee profile, or a Mod profile, etc.
7 years ago
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Sooooo? :/ It's just about giving your info on a fake site identical to steam?

7 years ago
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No, also scripting it sounds like. So they insert javascript code in the page that you're viewing, and it acts like you in the browser to do stuff in the market, like buying items.

7 years ago
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Oh, so even if you don't give your info, it's enough to get affected? :O Damn. :(

7 years ago
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As far as i know, if you have opened one infected tab, and you open, lets say bank account website in other tab and login, you can read login in password from other tabs... Javascript blocker for life.

7 years ago
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NO.
What this is about is calling URLs from a Tab in the same domain. means from steamcommunity.com/profile/XXX you can call steamcommunity.com/market/buyOverpricedItem and for steam its the same as if you would have bought the item yourself.
You can NOT influence or read other tabs (only if both are manipulated) and you can not do Cross-Domain stuff (not calling store.steampowered from steamcommunity).

7 years ago
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I've just installed to see what this no script blocker thing was for and it looked like in the picture. Nothing new, my phone was always blocking those and now I'm in a pc browser which websites don't work properly in it. Don't know how to set up it though.

View attached image.
7 years ago
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You should have white bar at bottom. You press setttings and something like "dont block steamgifts.com"

You can do the same for domains you feel secure.

On other hand you will see how many websites use scripts from external domains...

7 years ago
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7 years ago
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Mr. Cat here explained it perfectly.

7 years ago
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So, it doesn't matter if I click on a link? The problem is when I check steam profiles with implemented javascript codes? So, nothing will happen if I check out "healthy" steam profiles or groups and, especially, nothing will happen if steam on browser won't ask me my name and password? I mean, this trick only works to get your info by joining a fake site identical to steam and giving them your name and password? And it only works on browsers?

7 years ago
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You'll never know if a profile is healthy and no, it's not only the fake site thing (that's called phishing)
it could modify what do you see, like adding a legit "steam member" badge on a random user, or buy something on the market

7 years ago
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And the last thing is the mosty scary. o.O Damn, I hope I didn't get harmed. ;_;

7 years ago
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7 years ago*
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I read everything and I can understand now, but if I can't assume that any profile is healthy, then how can I know that I'm not affected already, since I'm usually using steam on browser?
EDIT: I read your edit. This only works when having a browser window (with steam obviously) open or no matter what (as long as you visited an affected profile at some point obviously)?

7 years ago
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7 years ago
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Btw, a guy added me yesterday, telling me to avoid a guy named (can't say the name here) because he scammed him. I checked him out on my steam APP (not from browser), by searching his name on steam community. Then, I copied-pasted his profile link on steamrep and saw that he is already banned there, so I told the other guy he's already marked as a scammer. Then he told me he didn't know it, he wrote me a troll text that he had in his steam description, then deleted me. Should I be worried? You can't possibly know if he wanted to affect my profile, but did I do anything that would put me in harm's way? And finally, when this thing get fixed, even if I got affected, should I still be worried? I disconnected steam from my browser, btw. These are my final questions, so don't hate me. :B Thanks a lot for your help.

7 years ago
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7 years ago
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Of course you can't know that - I only asked if there's a possibility that this happened. Anyway, thanks a lot. Have a nice day. ;)

7 years ago
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7 years ago
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I love you. <3.

7 years ago
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This exploit happens in activity feed too, so it may be a good idea to not open the activity feed until this is fixed.

7 years ago
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bumperino!

7 years ago
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update:

Valve have disabled Guide Showcases which means noone else can attempt this exploit. Now we just wait for them to clean up the profiles that have already abused this.

7 years ago
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added to op

7 years ago
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Not yet. At least the existing guide showcases are still there for now.

7 years ago
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existing guide showcases are still there

that's what it states

7 years ago
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7 years ago
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you can always stalk me ;)

7 years ago
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7 years ago
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I'm going to report you to Interpol for home privacy invasion

7 years ago
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View attached image.
7 years ago
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Alf!
Thank you for the memories.

7 years ago
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Thank God for this then.

7 years ago
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Ouch make me feel worried... :/
Anyway thank you for the info

7 years ago
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Yeah how the bloody hell you can be sure you are not infected? :/

7 years ago
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Yep
Steam will put an end to it and quickly i hope.

7 years ago
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Change your password and stay away from the steam community and you should be fine. I almost got fucked over already by someone my boyfriend knows >.>

7 years ago
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But but i want to annoy my steam friends. :x
You know like give them 10 notifications. :p

7 years ago
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You can still annoy them, just dont visit any page.

I have 6 unread messages so I will assume that was you :P Gonna read it when I am home in an hour ;)

7 years ago
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Nope not me. ;)

7 years ago
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After yesterday I dont believe you for a second ;)

7 years ago
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OH it was actually not you. Woooops

7 years ago
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Like boy who cried wolf, noone would believe either when i was in danger. :o

7 years ago
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Would a logout from the Browser help? They can't take any actions on an account if there is no account in the first place, can they?

7 years ago*
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Correct, but can still open other phishing sites etc.

7 years ago
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1 thing at a time. I can't have solutions for everything :D

Actually, don't visit any Steam profiles. BUM, problem solved!

7 years ago
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You can't buy without an account, so obviously yes

7 years ago
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-1 problem then :D

7 years ago
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it's still safe to use any steamrelated addon on firefox/chrome? (things like enhanced steam)

7 years ago
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si, sono indipendenti

7 years ago
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+rep for being so pizza

7 years ago
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macaroni tarantella ♥

7 years ago
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BUMP. Just posted it in 3 my country facebook groups. I want people to be safe.

7 years ago
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rip

7 years ago
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bump

7 years ago
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Meh, okay. What am I going to lose with that script? I assume they will fully reimburse all the loses if that script hits me, cause it's completely 100% their fault with holes in their security.

🤦‍♀️

7 years ago
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Don't be so sure.

7 years ago
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Has anyone been affected

7 years ago
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7 years ago
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wtf

7 years ago
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Another reason why we should have nuked javascript from the face of the Earth ages ago.

7 years ago
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7 years ago
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Yes, Python in the browser seems a lot safer 😀🙃👀

7 years ago
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CVE ID?

7 years ago
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