CVE-2026-9312 | THREATINT

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 3.16.20, 3.17.17, 3.18.11, 3.19.8, 3.20.4, and 3.21.1. This vulnerability was reported via the GitHub Bug Bounty program.

PUBLISHED Reserved 2026-05-22 | Published 2026-05-27 | Updated 2026-05-27 | Assigner GitHub_P

CRITICAL: 9.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-918 Server-Side Request Forgery (SSRF)

Product status

Default status
affected

3.16.0 (semver)
affected

3.17.0 (semver)
affected

3.18.0 (semver)
affected

3.19.0 (semver)
affected

3.20.0 (semver)
affected

3.21.0 (semver) before 3.21.1
affected

Credits

ahacker1 finder

References

docs.github.com/…nterprise-server@3.16/admin/release-notes release-notes

docs.github.com/…nterprise-server@3.17/admin/release-notes release-notes

docs.github.com/…nterprise-server@3.18/admin/release-notes release-notes

docs.github.com/…nterprise-server@3.19/admin/release-notes release-notes

docs.github.com/…nterprise-server@3.20/admin/release-notes release-notes

docs.github.com/…nterprise-server@3.21/admin/release-notes release-notes

cve.org (CVE-2026-9312)

nvd.nist.gov (CVE-2026-9312)

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