Vulnerability · Published Feb 18, 2026 · Assigned by GitHub_P
CVE-2026-0573Improper Handling of HTTP Redirects vulnerability was identified in GitHub Enterprise Server that allowed leaking of authorization token and enabled remote code execution
High 7.6
In plain English
A high-severity open redirect in Enterprise Server from GitHub. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GitHub | Enterprise Server | 3.14 – through 3.14.213.15 – through 3.15.163.16 – through 3.16.123.17 – through 3.17.93.18 – through 3.18.33.19 – through 3.19.1 |
Weakness: CWE-601 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References
- https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.22 release-notes
- https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.17 release-notes
- https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.13 release-notes
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.10 release-notes
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.4 release-notes
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.2 release-notes