CVE-2026-6092: Encrypt-then-MAC could fall back to MAC-then-Encrypt when HAVE_ENCRYPT_THEN_MAC is configured

mediumCVSS 5.3CVE-2026-6092

CSIRTS triage

Other

What: The vulnerability could allow a fallback from Encrypt-then-MAC to MAC-then-Encrypt under certain configurations.
Who is affected: Systems configured with HAVE_ENCRYPT_THEN_MAC may be affected.
Urgency: Remediation is medium urgency due to the medium severity rating.
Action: Update configurations as necessary and apply patches when released.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.3
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6092

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-2026-60920.21% 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-2026-6092	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

mediumCVE-2026-6092: When HAVE_ENCRYPT_THEN_MAC is configured, the implementation could fall back to MAC-then-Encryp…nvd

Recent advisories for Encrypt-then-MAC

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.

mediumCVE-2026-6092: When HAVE_ENCRYPT_THEN_MAC is configured, the implementation could fall back to MAC-then-Encryp…nvd · 2026-06-25