Observable discrepancy in Gitea - CVE-2026-73504
Published: August 31, 2026
Vulnerability identifier: #VU146364
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-73504
CWE-ID: CWE-203
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to confirm the association between an artifact ID and a named private repository.
The vulnerability exists due to observable discrepancy in the raw Actions artifact download endpoint when validating signed artifact download URLs. A remote attacker can submit requests with guessed global artifact IDs and an invalid signature to confirm the association between an artifact ID and a named private repository.
Artifact contents are not exposed, and inaccessible and nonexistent repositories return the same status.
Affected software
Gitea
How to mitigate CVE-2026-73504
Install security update from vendor's website.
Gitea - update to 1.27.3