What’s Vulnerable › Vulnerabilities

CVE-2026-9312: Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed access to internal services via path traversal in upload endpoint

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 9.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-07-23
• Weakness: CWE-918

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

• GitHub Enterprise Server: from 3.16.0 before 3.16.19; from 3.17.0 before 3.17.16; from 3.18.0 before 3.18.10; from 3.19.0 before 3.19.7; from 3.20.0 before 3.20.3; 3.21.1-rc1 — fixed in 3.16.19, 3.17.16, 3.18.10, 3.19.7, 3.20.3

How to fix

Upgrade to a fixed version: GitHub Enterprise Server 3.16.19, 3.17.16, 3.18.10, 3.19.7. Check the vendor advisory for mitigations.

References

• https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17
• https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11
• https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8
• https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4
• https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.2

Get alerted when CVE-2026-9312 or the next vulnerability affects your stack