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CVE-2026-11239: Chromium: CVE-2026-11239 Insufficient validation of untrusted input in Extensions

unknownCVE-2026-11239
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.

CSIRTS triage

vendor: Microsoftproduct: EdgeOther
What
There is insufficient validation of untrusted input in Extensions.
Who is affected
Users of Microsoft Edge (Chromium-based) are affected.
Urgency
Remediation is necessary as it could lead to potential exploitation.
Action
Update to the latest version of Microsoft Edge.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
unknown
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-11239

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-11239coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Chromium

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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