SSRF in GitHub Enterprise Server
CVE-2026-9312
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
EPSS: 0.066 (93.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Github Enterprise Server — versions 3.16.0, 3.17.0, 3.18.0
- Github Enterprise_server — versions 3.21.1
Weakness classification (CWE)
References
- product-cna@github.com (release-notes, Product, Release Notes)
- product-cna@github.com (release-notes, Product, Release Notes)
- product-cna@github.com (release-notes, Product, Release Notes)
- product-cna@github.com (release-notes, Product, Release Notes)
- product-cna@github.com (release-notes, Product, Release Notes)
- product-cna@github.com (release-notes, Product, Release Notes)
- product-cna@github.com (release-notes)
Frequently asked questions
- What is CVE-2026-9312?
- CVE-2026-9312 is a high-severity vulnerability in GitHub Enterprise Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.2/10. Published 2026-05-27.
- How severe is CVE-2026-9312?
- High severity. CVSS v3 base score is 8.2 out of 10.