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CVE-2026-8924: trailing dot domain super cookie

criticalCVSS 9.1CVE-2026-8924

CSIRTS triage

Other
What
A critical vulnerability related to trailing dot domain super cookies.
Who is affected
Affected users of the impacted systems.
Urgency
Remediation is critical due to the high CVSS score and potential impact.
Action
Investigate and apply necessary mitigations.

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

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.1
Published
2026-07-02
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8924

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-2026-8924coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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