CVE-2026-0573

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.

PUBLISHED Reserved 2026-01-02 | Published 2026-02-18 | Updated 2026-02-18 | Assigner GitHub_P

Problem types

CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

Product status

Credits

R31n finder

References

docs.github.com/...nterprise-server@3.14/admin/release-notes release-notes

docs.github.com/...nterprise-server@3.15/admin/release-notes release-notes

docs.github.com/...nterprise-server@3.16/admin/release-notes release-notes

docs.github.com/...nterprise-server@3.17/admin/release-notes release-notes

docs.github.com/...nterprise-server@3.18/admin/release-notes release-notes

docs.github.com/...nterprise-server@3.19/admin/release-notes release-notes

cve.org (CVE-2026-0573)

nvd.nist.gov (CVE-2026-0573)

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