Critical 9.2Published May 26, 2026

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

Updated under an hour ago (Oct 26, 2026, 8:00 PM ET)

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It affects GitHub Enterprise Server. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 9.2 CRITICAL (v4.0, CNA)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
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: Modified
Record last updated: Jun 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

GitHub Enterprise Server github:enterprise_server (from the name)	from 3.16.0 through 3.16.19; fixed at 3.16.20; from 3.17.0 through 3.17.16; fixed at 3.17.17; from 3.18.0 through 3.18.10; fixed at 3.18.11; from 3.19.0 through 3.19.7; fixed at 3.19.8; from 3.20.0 through 3.20.3; fixed at 3.20.4; from 3.21.0 before 3.21.1; fixed at 3.21.1	CNA record
github enterprise_server 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	NVD

References

References

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

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.