CVE-2026-4821
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.
Affected products
2cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*range: <3.14.26
- cpe:2.3:a:github:enterprise_server:3.20.0:*:*:*:*:*:*:*
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
7- docs.github.com/en/enterprise-server@3.14/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.15/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.16/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.17/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.18/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.19/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.20/admin/release-notesnvdRelease NotesVendor Advisory
News mentions
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