Github
CVE-2026-0573
CRITICAL
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionGitHub Advisory
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.
AnalysisAI
URL redirection vulnerability in GitHub Enterprise Server allows attacker-controlled redirects through crafted URLs, potentially enabling credential theft via phishing.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Authenticated user access to GitHub Enterprise Server instance with repository_pages API enabled; ability to control artifact URLs or inject redirect targets in API responses; victim must click or trigger the crafted request via UI interaction Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 9.0. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Attacker crafts URL on the company's GitHub Enterprise domain that redirects to a phishing page mimicking the login, steals developer credentials or SSO tokens. |
| Remediation | Apply GitHub Enterprise Server update. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
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. …
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