Authorisation Flaw in Layout in Google Chrome prior to 157.0.8103.78 allowed a remote attacker to obtain cross-origin data via a crafted HTML page
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
There is no written leader briefing for this story yet. These questions come from the facts we hold.
Questions to ask IT
- Do we run Google Chrome and Microsoft Edge, and is every instance on version 157.0.8103.78 or later?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 13 Dec?
Next steps
- Confirm whether this affects systems or suppliers in your estate
Vulnerability facts
Full CVE detail CVE-2026-126854- 4.3 · MediumExploitable over the network without any account, but only if a user takes an action, such as opening a file or link. Low impact on confidentiality.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- Not listed
- ~0.2% estimated chance of attack in 30 days
- Before 157.0.8103.78
- 157.0.8103.78
Versions are as the CVE record states them; check the vendor advisory before planning a fix.
- The vulnerability is identified as CVE-2026-126854 and affects Google Chrome versions prior to 157.0.8103.78.
- An estimated 0.2% probability of attack exists for CVE-2026-126854 within 30 days, as of 2026-11-13, though this is a probability signal, not confirmed exploitation.
Next steps
- Review the advisory against your asset inventory and patch cadence
Summary
- Incorrect authorisation in Google Chrome's Layout component before version 157.0.8103.78 allowed remote attackers to access cross-origin data through a malicious HTML page.
- Microsoft Edge (Chromium-based) incorporates Chromium, which has resolved this vulnerability.
Read the original reportMicrosoft Security Update Guide RSS(opens in a new tab)
Products and services involved
- Google Chrome93% match confidence · CVE-2026-126854
- Microsoft Edge98% match confidence · CVE-2026-126854
Pulse
Last change 2h ago · Next recheck 14 Nov 2026, 23:11 UK time
- Story13 Nov 2026, 23:11 UK time · 2h ago
Linked reporting from Microsoft Security Update Guide RSS (vendor psirt).
Read source (Microsoft Security Update Guide RSS)
1 entry so far. The timeline chart appears once this story has more history.
Sources
Chromium CVE-2026-126854: Incorrect authorization
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Incorrect authorisation in Layout in Google Chrome prior to 157.0.8103.78 allowed a remote attacker to obtain cross-origin data via a crafted HTML page
- 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-2026-126854
- ConfirmedEstimated attack likelihood95% confidence
CVE-2026-126854 has an estimated ~0.2% chance of attack in 30 days (6.6th percentile) as of 2026-11-13 — probability signal, not confirmed exploitation