CVE-2026-8927: env-set cross-proxy Digest auth state leak

CSIRTS triage

What

There is a cross-proxy Digest authentication state leak.

Who is affected

Deployments using the affected environment are affected.

Urgency

Remediation is medium urgency due to the potential for exploitation.

Action

Apply relevant patches or updates.

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

2026-07-14

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8927

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-2026-89270.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 36% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• medium[UPDATE] [medium] cURL: Multiple vulnerabilitiescert-bund
• unknownMultiple vulnerabilities in Microsoft Azure Linux (July 15, 2026)cert-fr-avis
• criticalCVE-2026-8927: When reusing a libcurl handle for sequential transfers driven by environment-variable proxy con…nvd
• unknownMultiple vulnerabilities in cURL and libcurl (June 24, 2026)cert-fr-avis

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