Mozilla says Claude Opus 4.6 found 100+ bugs in Firefox in two weeks in January, 14 of them high-severity, more than the bugs typically reported in two months
Wall Street Journal Robert McMillan
Related Coverage
- Partnering with Mozilla to improve Firefox's security Anthropic
- Hardening Firefox with Anthropic's Red Team The Mozilla Blog
- AI Model Finds 22 Firefox Vulnerabilities in Two Weeks Blockonomi · Brenda Mary
- Anthropic's Claude finds first Firefox bug in 20 mins during test, Mozilla devs call it serious Digit · Ayushi Jain
- 5 Questions for Kimberly Powell Politico · Aaron Mak
- Firefox taps Anthropic AI bug hunter, but rancid RAM still flipping bits The Register · Thomas Claburn
- Anthropic's Claude found 22 vulnerabilities in Firefox over two weeks TechCrunch · Russell Brandom
- Claude AI Uncovers 22 Firefox Vulnerabilities in Two Weeks Cyber Security News · Guru Baran
- Mozilla fixes 22 security flaws flagged by Anthropic's AI Axios · Sam Sabin
- Security doesn't happen behind closed doors — it happens in the open. — Because Firefox is built in the open, anyone — researchers … Anthony Enzor-DeMeo
- Maybe the answer is “building security in” instead of “penetrate and patch,” huh @gadi ? — #swsec #MLsec #appsec — https://www.wsj.com/... @cigitalgem@sigmoid.social · Gary McGraw
- I've been saying this for months now: — The open source contribution slopathon predates AI, I remember when projects would block new contributors during Hacktoberfest to protect themselves from the onslaught of “Updated README.md” — Mozilla shows that this doesn't have to be the case. … @budududuroiu@hachyderm.io · Bogdan Buduroiu
- Hardening Firefox with Anthropic's Red Team Hacker News
- Hardening Firefox with Anthropic's Red Team Lobsters
- Anthropic's Claude AI uncovers over 100 security vulnerabilities in Firefox The Decoder · Matthias Bastian
- Anthropic Finds 22 Firefox Vulnerabilities Using Claude Opus 4.6 AI Model The Hacker News
- Threat Intelligence | Breaking Cybersecurity News The Hacker News
- Mozilla Firefox Nova: Internal Project Reveals Major Visual Overhaul Ubergizmo · Paulo Montenegro
- Mozilla says Claude AI uncovered over 100 Firefox bugs in just two weeks, including 14 high-severity flaws TechSpot · Alfonso Maruccia
Discussion
-
@frankieislost
Frankie
on x
the key point is that we're currently in a golden window where LLMs are asymmetric weapons: they are more effective tools for the defenders than the attackers there is no reason to believe this will last, and we should harden all software as much as possible before that changes […
-
@anthropicai
@anthropicai
on x
We partnered with Mozilla to test Claude's ability to find security vulnerabilities in Firefox. Opus 4.6 found 22 vulnerabilities in just two weeks. Of these, 14 were high-severity, representing a fifth of all high-severity bugs Mozilla remediated in 2025. [image]
-
@gallabytes
@gallabytes
on x
this is the worst the technology will ever be at finding vulns. going to take a near-total overhaul of the software stack. defense beats offense in cyber but only if defense takes the magnitude of the task seriously enough for long enough.
-
@noahpinion
Noah Smith
on x
Someone is going to vibe-code the doomsday virus
-
@rez0__
Joseph Thacker
on x
THIS IS WHAT IVE BEEN SAYNIGGG!! 4.6 is a step change!
-
@hamandcheese
Samuel Hammond
on x
A very practical example of why US AI leadership (and compute advantage) matters. If China got to Opus 4.6 first, do you think they'd tell US software companies about their code vulnerabilities or try to exploit them before we caught up?
-
@kimmonismus
@kimmonismus
on x
Slow at first - then suddenly all at once
-
@yuchenj_uw
Yuchen Jin
on x
Both OpenAI and Anthropic are solving my vibe coding insecurity. [image]
-
@logangraham
Logan Graham
on x
Back in ~November, our team picked a stretch goal of seeing if we could find and fix vulnerabilities in Firefox with Opus 4.6. In 2 weeks, we found 22, and ~1/5th of all high severity CVEs in a year. For our team, this feels like a rubicon moment. [image]
-
@hackinglz
Justin Elze
on x
I love these blogs because they always contain something like this. “We ran this test several hundred times with different starting points, spending approximately $4,000 in API credits. Despite this, Opus 4.6 was only able to actually turn the vulnerability into an exploit in t…
-
r/firefox
r
on reddit
Anthropic'c Claude found 22 vulnerabilities in Firefox in just two weeks