Microsoft GitHub Enterprise Server: Mehrere Schwachstellen
WID-SEC-2026-3151 · first 02.09.2026 · updated 02.09.2026 · CVSS 8,8
What it is about
GitHub ist ein netzbasierter Dienst zur Versionsverwaltung für Software-Entwicklungsprojekte. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Microsoft GitHub Enterprise Server ausnutzen, um Informationen offenzulegen oder beliebigen Code auszuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- Informationen offenzulegen oder beliebigen Code auszuführen
Am I affected?
Affected according to the BSI:
- Microsoft GitHub Enterprise Server <3.22
- Microsoft GitHub Enterprise Server <3.17.19
- Microsoft GitHub Enterprise Server <3.18.13
- Microsoft GitHub Enterprise Server <3.19.10
- Microsoft GitHub Enterprise Server <3.20.6
- Microsoft GitHub Enterprise Server <3.21.4
- Microsoft GitHub Enterprise Server <3.17.20
- Microsoft GitHub Enterprise Server <3.18.14
- Microsoft GitHub Enterprise Server <3.19.11
- Microsoft GitHub Enterprise Server <3.20.7
- Microsoft GitHub Enterprise Server <3.21.5
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 3.22
- Microsoft GitHub Enterprise Server 3.17.19
- Microsoft GitHub Enterprise Server 3.18.13
- Microsoft GitHub Enterprise Server 3.19.10
- Microsoft GitHub Enterprise Server 3.20.6
- Microsoft GitHub Enterprise Server 3.21.4
- Microsoft GitHub Enterprise Server 3.17.20
- Microsoft GitHub Enterprise Server 3.18.14
- Microsoft GitHub Enterprise Server 3.19.11
- Microsoft GitHub Enterprise Server 3.20.7
- Microsoft GitHub Enterprise Server 3.21.5
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 Advisory Database vom 2026-09-01 github.com
- GitHub Advisory Database vom 2026-09-01 github.com
- GitHub Advisory Database vom 2026-09-01 github.com
- EU Vulnerability Databse vom 2026-09-01 euvd.enisa.europa.eu
- EU Vulnerability Databse vom 2026-09-01 euvd.enisa.europa.eu
- EU Vulnerability Databse vom 2026-09-01 euvd.enisa.europa.eu
CVE: CVE-2026-18730, CVE-2026-19118, CVE-2026-76851
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.