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CVE-2026-8286: wrong STARTTLS connection reuse

highCVSS 8.1CVE-2026-8286

CSIRTS triage

Other
What
There is a vulnerability related to incorrect STARTTLS connection reuse.
Who is affected
Deployments using STARTTLS are affected.
Urgency
Remediation is urgent due to the high severity rating of 8.1.
Action
Implement a patch or mitigation as soon as it is available.

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

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.1
Published
2026-07-02
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8286

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-2026-8286coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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