CVE-2026-76851Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed remote code execution via network access from pre-receive hooks to internal services
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-918
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_P
- NVD analysis
- Analyzed
- Record last updated
- Sep 2, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
GitHub Enterprise Server github:enterprise_server (from the name) | from 3.17.0 through 3.17.19; fixed at 3.17.20; from 3.18.0 through 3.18.13; fixed at 3.18.14; from 3.19.0 through 3.19.10; fixed at 3.19.11; from 3.20.0 through 3.20.6; fixed at 3.20.7; from 3.21.0 through 3.21.4; fixed at 3.21.5; 3.22.0 not affected | CNA record |
github enterprise_server github:enterprise_server | before 3.17.20; from 3.18.0 before 3.18.14; from 3.19.0 before 3.19.11; from 3.20.0 before 3.20.7; from 3.21.0 before 3.21.5 | NVD |
References
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.20release-notes, vendor-advisory
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.14release-notes, vendor-advisory
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.11release-notes, vendor-advisory
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.7release-notes, vendor-advisory
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.5release-notes, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.