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The story of how I could steal credentials on Infosec Mastodon with a HTML injection vulnerability, without needing to bypass CSP.

Stealing passwords from infosec Mastodon - without bypassing CSP

portswigger.net/research/steal

@ecksmc
Um, this is bad.

@th3j35t3r
J, I'm guessing we're not vulnerable to this here?

@voltronic @ecksmc

Lol. Yes. This is VERY bad. and Nope COSO is not vulnerable to this attack.

@th3j35t3r @voltronic @ecksmc if we joined coso before the fork, and changed pw recently, we good?

@BillyBones @th3j35t3r @LaurelGreen @ecksmc
I wonder how all those infosec people who joined that instance will feel about this news.

I was surprised so many of thoseb people went there instead of here, when this has been an established thing for years.

@voltronic All I can think is that they're 'louder'. And while we obviously encourage new Cosonauts, I prefer our more understated way of "Try it but we don't tolerate idiots" rather than "Come on into our home and help yourselves to whatever's in the cupboards" 👍

@th3j35t3r @LaurelGreen @ecksmc

@BillyBones
There's also the semi-organized disinfo campaign against CoSo going on the past few weeks.

@th3j35t3r @LaurelGreen @ecksmc

@voltronic @BillyBones @th3j35t3r @LaurelGreen @ecksmc Whenever I see someone talking smack about CoSo I post about all the positive things here and debunk their absolute nonsense and am usually not alone in doing so. That crap really frosts my cha-cha!!

@ecksmc 🎵 This is why we sanitize our inputs
Your frontend is your foe~
When you let full tags go in
And don't allowlist text only
Then you'll be vulner-a-ble~ 🎵

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