CVE-2026-6412: Continued acceptance of SHA-1/MD5 digests in certificate processing

mediumCVSS 4.3CVE-2026-6412

CSIRTS triage

Other

What: The vulnerability involves the continued acceptance of SHA-1/MD5 digests in certificate processing.
Who is affected: Deployments using affected certificate processing methods.
Urgency: Remediation is medium urgency due to the potential for exploitation in certain contexts.
Action: Review and update certificate processing methods to avoid SHA-1/MD5 digests.

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 4.3
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6412

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-2026-64120.07% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 0% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-6412	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

mediumCVE-2026-6412: Certificate policy and RFC 8446 compliance concerns regarding the continued acceptance of SHA-1…nvd

Recent advisories for Continued acceptance of

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-2026-6412: Certificate policy and RFC 8446 compliance concerns regarding the continued acceptance of SHA-1…nvd · 2026-06-25