Input Validation Flaw in Extensions in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to bypass web origin policy into a privileg…
At a glance
~0.2% estimated chance of attack in 30 days. Exploitation not confirmed.
Low rather than Medium: UK relevance is 40 of 100, little UK-specific signal so far.
Briefing
- Do not treat uncorroborated claims as confirmed breaches.
Questions to ask IT
- Do we run Google Chrome and Microsoft Edge, and is every instance on version 155.0.8059.39 or later?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 1 Dec?
Next steps
- Confirm whether this affects systems or suppliers in your estate
Vulnerability facts
Full CVE detail CVE-2026-106331- 6.5 · MediumExploitable over the network without any account, but only if a user takes an action, such as opening a file or link. High impact on integrity.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- Not listed
- ~0.2% estimated chance of attack in 30 days
- Before 155.0.8059.39
- 155.0.8059.39
Versions are as the CVE record states them; check the vendor advisory before planning a fix.
No technical write-up beyond these facts and the summary below yet.
Next steps
- Review the advisory against your asset inventory and patch cadence
Summary
- Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.
- CVE-2026-106331 has an estimated ~0.2% chance of attack in 30 days (12.5th percentile) as of 2026-10-16 — probability signal, not confirmed exploitation
Read the original reportMicrosoft Security Update Guide RSS(opens in a new tab)
Products and services involved
- Google Chrome93% match confidence · CVE-2026-106331
- Microsoft Edge98% match confidence · CVE-2026-106331
Pulse
Last checked 7d ago · Recheck overdue since 2 Nov 2026, 21:12 UK time
held at 0.2%; ranking metadata was updated.
Sources
Chromium CVE-2026-106331: Improper input validation
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Improper input validation in Extensions in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to bypass web origin policy into a privileg…
- ProbableSummary fact75% confidence
Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see [Google Chrome Releases](https://chromereleases.googleblog.com/2026) for more information.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-106331
- ConfirmedEstimated attack likelihood95% confidence
CVE-2026-106331 has an estimated ~0.2% chance of attack in 30 days (12.5th percentile) as of 2026-10-16 — probability signal, not confirmed exploitation