{"id":"CVE-2026-78433","title":"Gitea's web attachment handler skips its cross-repository ownership check for attachments created before 16 January 2026 and checks permissions against the repository named in the request URL instead","summary":"Gitea's web attachment handler skips its cross-repository ownership check for attachments created before 16 January 2026 and checks permissions against the repository named in the request URL instead. An unauthenticated attacker who know…","severity":"medium","cwe":["CWE-284","CWE-639","CWE-863","CWE-1220"],"published":"2026-10-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T16:04:39.483","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78433","references":[{"url":"https://blog.gitea.com/release-of-1.27.3/","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/pull/39048","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/pull/39077","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/releases/tag/v1.27.3","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-frpv-2xgv-wxpq","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-14T15:36:14.032Z","vendor":"Gitea","product":"gitea.dev","affected":["gitea.dev >= 1.26.0 <= 1.27.2"],"epss":0.00369,"epssPercentile":0.306,"cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-18T13:35:32.390912Z"},"cvssSource":"adp","slug":"CVE-2026-78433","body":"## Overview\n\nGitea's web attachment handler skips its cross-repository ownership check for attachments created before 16 January 2026 and checks permissions against the repository named in the request URL instead. An unauthenticated attacker who knows a private attachment's UUID can request it through a public repository's attachment path and retrieve its contents. This can expose issue and pull request attachments or release assets; the random attachment UUID must already be known to the attacker.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":224418,"id":"CVE-2026-78433","ts":1792331049168,"field":"cvss","old":null,"new":"5.9"},{"seq":224417,"id":"CVE-2026-78433","ts":1792331049168,"field":"severity","old":"none","new":"medium"}]}