CVE-2026-11703: Missing SNI/ALPN binding on stateful (session-ID) TLS session resumption

highCVSS 7.5CVE-2026-11703

CSIRTS triage

Other

What: Missing SNI/ALPN binding on stateful TLS session resumption.
Who is affected: Users of affected TLS implementations.
Urgency: Remediation is urgent due to the high severity of the vulnerability.
Action: Implement necessary configurations to ensure SNI/ALPN binding.

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 7.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-11703

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.

Low exploitation riskCVE-2026-117030.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-11703	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-11703: Missing SNI/ALPN binding on stateful (session-ID) resumption, which previously skipped the bin…nvd

Recent advisories for Missing SNI/ALPN binding

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.

highCVE-2026-11703: Missing SNI/ALPN binding on stateful (session-ID) resumption, which previously skipped the bin…nvd · 2026-06-25