back in 2022 i found a bug that would let me, with no user interaction, turn any chromium-based browser into a permanent js botnet member

in edge, you wouldn't even notice anything out-of-place, and would stay connected to the c2 even after closing the browser

today, almost 4 years later, the bug is finally public:
https://issues.chromium.org/issues/40062121

OH NO I JUST REALIZED THIS IS NOT ACTUALLY PROPERLY FIXED AND STILL WORKS 💀💀

even worse, edge no longer even makes the download menu pop up, so it's completely silent js rce that keeps running even after you close the browser !!

all from just visiting a single website once !!

issue set to private again, hopefully it'll get fixed properly this time :p
@rebane2001 Nice find! I should have woken up earlier to see the details. 😅
@rebane2001 fucking embarrassing
@rebane2001 Well, too late, it has already been archived :x

@SamantazFox out of curiosity, where? the archive.org captures don't load for me

edit: ty :)

@rebane2001 @SamantazFox It's on archive.today/.is/.ph. Only go there with a content blocker, you're DDoSing a small blog otherwise: https://gyrovague.com/2026/02/01/archive-today-is-directing-a-ddos-attack-against-my-blog/
archive.today is directing a DDOS attack against my blog

Around January 11, 2026, archive.today (aka archive.is, archive.md, etc) started using its users as proxies to conduct a distributed denial of service (DDOS) attack against Gyrovague, my personal b…

Gyrovague

@Lenni @rebane2001 @SamantazFox

Archive.today is rolling out Google's QR reCaptcha as well paired with altering snapshots, seems like potential vector for a bad time.

https://mstdn.social/@milagemayvary/116601485354673260

@milagemayvary @Lenni @rebane2001 @SamantazFox

archive.org has already scrubbed archives of incriminating words by sex offenders like Andrew Tate, Vitalik Butterin, and a DOGE staffer, so really, who can I wing for?

@PuppyFromLosAndes @Lenni @rebane2001 @SamantazFox

I assume we're speaking of Kiwi Farms?

Is it scrubbed from archive.org, or is it present for research purposes?

I would assume they have kept the data, I think they would respond to a subpoena with the snapshot.

After about 10 minutes of searching, I'm not entirely sure if archive.today has been used as admissable evidence in a court room let alone successfully.

IANAL, I feel like this is a legal quagmire & legally safer to exclude?

@Lenni @rebane2001 @SamantazFox
I do genuinely wonder why the blog's author is so interested in doxing the archive.is's operator?
The response of getting DDoS:ed by the operator does also make it look like they hit close.
@rebane2001 really cool work. Didn't realize this sort of bug class even existed. Hope they up the bounty; this seems worth more than $1000
@rebane2001 could you test vivaldi? :D

@Viss @rebane2001 it's mentioned in an Ars Technica article that Vivaldi is also vulnerable.

>Other browsers Rebans confirmed as vulnerable include Brave, Opera, Vivaldi, and Arc.

@Viss @rebane2001 Vivaldi is Chromium, why do people think Chromium issues don't apply to it?
@rebane2001 Is there a CVE number for this? Some reports say it is fixed, others not.
#chromium #chrome
@jtb no CVE number (yet), definitely not fixed
Google publishes exploit code threatening millions of Chromium users

Google publishes exploit code before patch, reported 42 months earlier, is fixed.

Ars Technica
@rebane2001 I guess it's a good thing I asked 😂
@rebane2001 So much for Edge having “the added trust of Microsoft”.
@rebane2001 Is this what they call a 1259 day?
@henry_null @rebane2001 Cue Microsoft issuing a press release accusing Rebane of "violating coordinated vulnerability best practices." They've barely had time to react, after all...
@EdCates @rebane2001 I mean its them who made it public first I guess🤷 https://issues.chromium.org/issues/40062121#comment56
Chromium

@EdCates
Then demanding that @GossiTheDog remove the account from all of the Fediverse
https://cyberplace.social/@GossiTheDog/115174005290146637
@henry_null @rebane2001
Kevin Beaumont (@[email protected])

Attached: 1 image Apparently Microsoft don’t understand how the Fediverse works, and want me to delete the parody account @[email protected] 🤣🫡

Cyberplace
@rebane2001 I've got a dumb question: Is this something that can be mitigated with a uBlock filter? It reads like it could be but I don't know this stuff well.
@rebane2001 @cR0w And with Noscript ?
@Strabisme @cR0w yes, provided you disable js or service workers on the page

@rebane2001 @cR0w Didn't try, but in theory, full (Manifest v2) uBO should be able to inject a CSP policy that sets worker-src 'none';

https://github.com/gorhill/uBlock/wiki/Static-filter-syntax#csp

Probably something like
||$csp=worker-src 'none'
to disable service workers everywhere?

@rebane2001 @cR0w (I assume using it like that might break extensions that use service workers? Can an extension inject CSP headers into a different extension? No idea.)

Anyways, turns out someone wrote up exactly that at some point: https://bonina.eu/web/disable-service-workers-chromium-browsers/

How to disable Service Workers on Chromium based browsers through uBlock · bonina.eu

Service Workers may pose risks, with the next steps we can effectively disable them.

@rebane2001 well that's not good...
@rebane2001 BeEF module ftw! 🎉
@rebane2001 Service Workers working as intended… :|
@rebane2001 So they have fixed the bug. The one with the download menu popping up during eval.
@rebane2001 fucking spectacular.
@rebane2001 if you disable running in background in edge does it still run if closed?

@rebane2001
oooof, thats not good😬
3,5 years...

sent from my firefox

@henry_null @rebane2001

i second this, sent from my epiphany

@utf_7 @henry_null @rebane2001 fellow rare #GNOME Web user found in the wild
@rebane2001 oops, happy 0day 4year to those who celebrate
@rebane2001 @zhenech Emotional (and security) rollercoaster, full steam ahead…
@[email protected]

Hmmm....

"If I boost this, more hackers will know about the exploit, but also, more affected people may be attacked..."

boost

They installed it, yolo.

@rebane2001

Pfffrrrrsssshhh.

Even the "most secure web browser" ends up being just as incompetent as the rest.

@rebane2001 I am once again vindicated for having service workers blocked with uBlock
@rebane2001 well that doesn't look too good for chromium based browser