A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed remote code execution on the instance. Insufficient network isolation allowed malicious pre-receive hook code to impersonate an internal service and redirect trusted internal requests to a privileged service, leading to elevated code execution. Exploitation required pre-receive hook networking to be enabled and either site administrator privileges or write access to a repository containing a configured pre-receive hook. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.20, 3.18.14, 3.19.11, 3.20.7, and 3.21.5. This vulnerability was reported via the GitHub Bug Bounty program.
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History
Tue, 08 Sep 2026 13:15:00 +0000
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| CPEs | cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* | |
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cvssV3_1
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Wed, 02 Sep 2026 10:45:00 +0000
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ssvc
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Wed, 02 Sep 2026 00:15:00 +0000
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| First Time appeared |
Github
Github enterprise Server |
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Github
Github enterprise Server |
Tue, 01 Sep 2026 22:00:00 +0000
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| Description | A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed remote code execution on the instance. Insufficient network isolation allowed malicious pre-receive hook code to impersonate an internal service and redirect trusted internal requests to a privileged service, leading to elevated code execution. Exploitation required pre-receive hook networking to be enabled and either site administrator privileges or write access to a repository containing a configured pre-receive hook. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.20, 3.18.14, 3.19.11, 3.20.7, and 3.21.5. This vulnerability was reported via the GitHub Bug Bounty program. | |
| Title | Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed remote code execution via network access from pre-receive hooks to internal services | |
| Weaknesses | CWE-918 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_P
Published: 2026-09-01T21:55:10.149Z
Updated: 2026-09-02T13:09:26.107Z
Reserved: 2026-08-19T21:26:22.221Z
Link: CVE-2026-76851
Updated: 2026-09-02T13:09:22.638Z
Status : Analyzed
Published: 2026-09-01T22:17:13.033
Modified: 2026-09-08T13:05:37.213
Link: CVE-2026-76851
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