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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
GitHub Enterprise Server affected
Version Status Constraints
3.16.0 affected ≤ 3.16.19
3.17.0 affected ≤ 3.17.16
3.18.0 affected ≤ 3.18.10
3.19.0 affected ≤ 3.19.7
3.20.0 affected ≤ 3.20.3
3.21.0 affected < 3.21.1

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.20 cve-icon cve-icon
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17 cve-icon cve-icon
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11 cve-icon cve-icon
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8 cve-icon cve-icon
https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4 cve-icon cve-icon
https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.1 cve-icon cve-icon
History

Wed, 27 May 2026 00:15:00 +0000

Type Values Removed Values Added
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.
Title Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed access to internal services via path traversal in upload endpoint
Weaknesses CWE-918
References
Metrics cvssV4_0

{'score': 9.2, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_P

Published:

Updated: 2026-05-27T00:02:32.159Z

Reserved: 2026-05-22T18:42:28.097Z

Link: CVE-2026-9312

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-27T00:16:39.020

Modified: 2026-05-27T00:16:39.020

Link: CVE-2026-9312

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-27T01:30:16Z

Weaknesses