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[NEW] [high] Microsoft GitHub Enterprise: Vulnerability enables file manipulation

highCVE-2026-17556
A remote, anonymous attacker can exploit a vulnerability in Microsoft GitHub Enterprise to manipulate files.

CSIRTS triage

vendor: Microsoftproduct: GitHub EnterprisePath traversal
What
A vulnerability allows remote anonymous attackers to manipulate files on GitHub Enterprise systems.
Who is affected
All deployments of Microsoft GitHub Enterprise are potentially affected.
Urgency
High severity; exploitation path is not yet documented but the attack surface is unauthenticated.
Action
Apply the security patch from Microsoft as soon as it becomes available; monitor GitHub Enterprise security advisories.

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

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Details

Source
CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity
high
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2667

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-2026-17556coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Microsoft GitHub Enterprise

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.

More from CERT-Bund (BSI) Security Advisories