CVE-2026-0573
CRITICALCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
2Tags
Description
An URL redirection vulnerability was identified in GitHub Enterprise Server that allowed attacker-controlled redirects to leak sensitive authorization tokens. The repository_pages API insecurely followed HTTP redirects when fetching artifact URLs, preserving the authorization header containing a privileged JWT. An authenticated user could redirect these requests to an attacker-controlled domain, exfiltrate the Actions.ManageOrgs JWT, and leverage it for potential remote code execution. Attackers would require access to the target GitHub Enterprise Server instance and the ability to exploit a legacy redirect to an attacker-controlled domain. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.19 and was fixed in versions 3.19.2, 3.18.4, 3.17.10, 3.16.13, 3.15.17, and 3.14.22. This vulnerability was reported via the GitHub Bug Bounty program.
Analysis
URL redirection vulnerability in GitHub Enterprise Server allows attacker-controlled redirects through crafted URLs, potentially enabling credential theft via phishing.
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Remediation
Within 24 hours: Disable the repository_pages API if not actively required, audit recent API access logs for suspicious redirect patterns, and notify all GitHub Enterprise administrators. Within 7 days: Implement WAF rules to block suspicious redirect chains from the repository_pages endpoint, restrict API access to trusted IP ranges, and rotate all Actions.ManageOrgs tokens. …
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