An improper neutralization of special elements vulnerability was identified in GitHub Enterprise Server that allowed an authenticated Management Console administrator to execute arbitrary OS commands via shell metacharacter injection in proxy configuration fields such as http_proxy. Exploitation of this vulnerability required access to the GitHub Enterprise Server instance and administrator privileges to the Management Console. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.
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History
Wed, 22 Apr 2026 00:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | An improper neutralization of special elements vulnerability was identified in GitHub Enterprise Server that allowed an authenticated Management Console administrator to execute arbitrary OS commands via shell metacharacter injection in proxy configuration fields such as http_proxy. Exploitation of this vulnerability required access to the GitHub Enterprise Server instance and administrator privileges to the Management Console. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program. | |
| Title | Proxy configuration command injection vulnerability found in GitHub Enterprise Server Management Console configuration API | |
| Weaknesses | CWE-78 | |
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cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_P
Published:
Updated: 2026-04-21T22:12:26.772Z
Reserved: 2026-03-25T13:55:26.048Z
Link: CVE-2026-4821
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Status : Received
Published: 2026-04-21T23:16:22.037
Modified: 2026-04-21T23:16:22.037
Link: CVE-2026-4821
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Weaknesses