Vulnerability · Published May 27, 2026 · Assigned by GitHub_P
CVE-2026-9312Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed access to internal services via path traversal in upload endpoint
Critical 9.2
In plain English
A critical-severity server-side request forgery in Enterprise Server from GitHub. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 9.2% (higher than 95% of all known vulnerabilities).
Official description
A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to send crafted requests to internal services by exploiting insufficient input validation in an upload endpoint. By injecting path traversal content into request parameters, an attacker could bypass the intended request flow and redirect internal API calls, potentially accessing internal services and exposing sensitive credentials. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.17, 3.18.11, 3.19.8, 3.20.4, and 3.21.2. This vulnerability was reported via the GitHub Bug Bounty program.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GitHub | Enterprise Server | 3.16.0 – through 3.16.193.17.0 – through 3.17.163.18.0 – through 3.18.103.19.0 – through 3.19.73.20.0 – through 3.20.33.21.0 – before 3.21.1 |
Weakness: CWE-918 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17 release-notes
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11 release-notes
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8 release-notes
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4 release-notes
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.2 release-notes