{"id":"CVE-2026-104626","title":"A user who can open a fork pull request can place workflow content with a shared run-level concurrency group into a Gitea Actions run that is awaiting approval","summary":"A user who can open a fork pull request can place workflow content with a shared run-level concurrency group into a Gitea Actions run that is awaiting approval. When a later run in that group cancels the blocked job, the run becomes term…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-841"],"vendor":"Gitea","product":"gitea.dev","affected":["gitea.dev <= 1.27.3"],"published":"2026-10-06","updated":"2026-10-07","sourceUpdated":"2026-10-07T21:17:08.760","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-104626","references":[{"url":"https://blog.gitea.com/release-of-28.0.0/","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/pull/39399","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/releases/tag/v28.0.0","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-93pj-3x56-5gc2","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-07T20:19:04.289390Z"},"epss":0.00156,"epssPercentile":0.04182,"ingestedAt":"2026-10-06T20:16:42.499Z","slug":"CVE-2026-104626","body":"## Overview\n\nA user who can open a fork pull request can place workflow content with a shared run-level concurrency group into a Gitea Actions run that is awaiting approval. When a later run in that group cancels the blocked job, the run becomes terminal while still marked as needing approval. If a maintainer later approves the run, Gitea passed the already-cancelled job back through concurrency preparation, set it to waiting, and made it claimable by a matching runner, executing fork-controlled workflow code. Exploitation requires the maintainer's later approval action, Actions to be enabled, and a runner that accepts the repository's jobs.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":217741,"id":"CVE-2026-104626","ts":1791406427794,"field":"cvss","old":null,"new":"8.8"},{"seq":217740,"id":"CVE-2026-104626","ts":1791406427794,"field":"severity","old":"none","new":"high"}]}