Microsoft GitHub Enterprise Server: Mehrere Schwachstellen
WID-SEC-2026-3530 · first 23.09.2026 · updated 23.09.2026 · CVSS 9,8
What it is about
GitHub ist ein netzbasierter Dienst zur Versionsverwaltung für Software-Entwicklungsprojekte. Ein Angreifer kann mehrere Schwachstellen in Microsoft GitHub Enterprise Server ausnutzen, um Informationen offenzulegen, Daten zu manipulieren, beliebigen Code auszuführen oder Cross-Site-Scripting-Angriffe durchzuführen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- Informationen offenzulegen
- Daten zu manipulieren
- beliebigen Code auszuführen oder Cross-Site-Scripting-Angriffe durchzuführen
Am I affected?
Affected according to the BSI:
- Microsoft GitHub Enterprise Server <3.17.21
- Microsoft GitHub Enterprise Server <3.18.15
- Microsoft GitHub Enterprise Server <3.19.12
- Microsoft GitHub Enterprise Server <3.20.8
- Microsoft GitHub Enterprise Server <3.21.6
- Microsoft GitHub Enterprise Server <3.22.1
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Microsoft GitHub Enterprise Server 3.17.21
- Microsoft GitHub Enterprise Server 3.18.15
- Microsoft GitHub Enterprise Server 3.19.12
- Microsoft GitHub Enterprise Server 3.20.8
- Microsoft GitHub Enterprise Server 3.21.6
- Microsoft GitHub Enterprise Server 3.22.1
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- GitHub Enterprise Server Release Notes vom 2026-09-22 docs.github.com
- GitHub Enterprise Server Release Notes vom 2026-09-22 docs.github.com
- GitHub Enterprise Server Release Notes vom 2026-09-22 docs.github.com
- GitHub Enterprise Server Release Notes vom 2026-09-22 docs.github.com
- GitHub Enterprise Server Release Notes vom 2026-09-22 docs.github.com
- GitHub Enterprise Server Release Notes vom 2026-09-22 docs.github.com
CVE: CVE-2026-75101, CVE-2026-77912, CVE-2026-77987
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.