Open Redirect in GitHub Enterprise Server
CVE-2026-0573
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.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (53.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.001
Affected products
- GitHub Enterprise Server — versions 3.14, 3.15, 3.16
- GitHub Enterprise Server
Weakness classification (CWE)
References
- docs.github.com/en/enterprise-server@3.14/admin/release-notes (release-notes, Product, Release Notes)
- docs.github.com/en/enterprise-server@3.15/admin/release-notes (release-notes, Product, Release Notes)
- docs.github.com/en/enterprise-server@3.16/admin/release-notes (release-notes, Product, Release Notes)
- docs.github.com/en/enterprise-server@3.17/admin/release-notes (release-notes, Product, Release Notes)
- docs.github.com/en/enterprise-server@3.18/admin/release-notes (release-notes, Product, Release Notes)
- docs.github.com/en/enterprise-server@3.19/admin/release-notes (release-notes, Product, Release Notes)
Frequently asked questions
- What is CVE-2026-0573?
- CVE-2026-0573 is a critical-severity vulnerability in GitHub Enterprise Server, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.0/10. Published 2026-02-18.
- How severe is CVE-2026-0573?
- Critical severity. CVSS v3 base score is 9.0 out of 10.