{"id":"CVE-2026-73539","state":"PUBLISHED","title":"Gitea external renderer argument injection and code execution","description":"Gitea substitutes a URL derived from the markup Context field into external renderer command templates without escaping the reference path before shell-style argument splitting. A crafted Context can inject additional renderer arguments, including options that load executable filter files. On deployments using a susceptible external renderer such as pandoc, a user who can place a filter file at an accessible path can cause it to execute as the Gitea service account; the public repository markup endpoint itself can be reachable without authentication.","publishedAt":"2026-10-14T14:37:44.243Z","updatedAt":"2026-10-18T13:32:51.154Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"Gitea","products":["Gitea Gitea"],"affected":[{"vendor":"Gitea","product":"Gitea","packageName":"gitea","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.27.1","versionType":"semver"}]}],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-579w-82gf-89m2","https://blog.gitea.com/release-of-1.27.2/","https://github.com/go-gitea/gitea/pull/38885","https://github.com/go-gitea/gitea/pull/38898","https://github.com/go-gitea/gitea/releases/tag/v1.27.2"],"weaknesses":["CWE-88"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73539.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73539","state":"PUBLISHED","datePublished":"2026-10-14T14:37:44.243Z","dateUpdated":"2026-10-18T13:32:51.154Z","assignerShortName":"Gitea","assignerOrgId":"88ee5874-cf24-4952-aea0-31affedb7ff2","dateReserved":"2026-08-13T16:50:59.746Z"},"containers":{"cna":{"title":"Gitea external renderer argument injection and code execution","descriptions":[{"lang":"en","value":"Gitea substitutes a URL derived from the markup Context field into external renderer command templates without escaping the reference path before shell-style argument splitting. A crafted Context can inject additional renderer arguments, including options that load executable filter files. On deployments using a susceptible external renderer such as pandoc, a user who can place a filter file at an accessible path can cause it to execute as the Gitea service account; the public repository markup endpoint itself can be reachable without authentication."}],"affected":[{"vendor":"Gitea","product":"Gitea","packageName":"gitea","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.27.1","versionType":"semver"}]}],"references":[{"url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-579w-82gf-89m2","name":"GitHub Security Advisory GHSA-579w-82gf-89m2","tags":["vendor-advisory"]},{"url":"https://blog.gitea.com/release-of-1.27.2/","name":"Gitea 1.27.2 release announcement","tags":["release-notes"]},{"url":"https://github.com/go-gitea/gitea/pull/38885","name":"Fix: go-gitea/gitea pull request #38885","tags":["patch"]},{"url":"https://github.com/go-gitea/gitea/pull/38898","name":"Fix: go-gitea/gitea pull request #38898","tags":["patch"]},{"url":"https://github.com/go-gitea/gitea/releases/tag/v1.27.2","name":"go-gitea/gitea v1.27.2 release","tags":["release-notes"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-88","lang":"en","type":"CWE","description":"CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')"}]}],"providerMetadata":{"shortName":"Gitea","orgId":"88ee5874-cf24-4952-aea0-31affedb7ff2","dateUpdated":"2026-10-14T14:37:44.243Z"},"credits":[{"lang":"en","value":"https://github.com/DshtAnger","type":"reporter"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-10-18T13:32:47.376516Z","id":"CVE-2026-73539","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-18T13:32:51.154Z"}}]}}}