{"id":"GHSA-cr4g-f395-h25h","revision":"1ba41c74ff8c4826a1b79040c79bf610","records":[{"revision":"1ba41c74ff8c4826a1b79040c79bf610","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-cr4g-f395-h25h","aliases":["CVE-2026-20706","GO-2026-5334"],"title":"Gitea: Token scope bypass on web archive download endpoint","description":"## Summary\n\nPR #37698 added checkDownloadTokenScope to /raw/*, /media/*, and attachment download web endpoints. The /archive/* endpoint (repo.Download in routers/web/repo/repo.go:372) was not included in the fix. This endpoint accepts OAuth2 tokens via webAuth.AllowOAuth2 (registered at routers/web/web.go:1649-1652) but does not call checkDownloadTokenScope or CheckRepoScopedToken.\n\nA personal access token with any non-repository scope (e.g., read:issue or read:misc) can download full repository archives (zip/tar.gz) of private repositories the token owner has access to.\n\n## Impact\n\nScope escalation: tokens scoped to non-repository categories can access full repository content through the archive download endpoint. Higher impact than endpoints fixed in #37698 because /archive/* serves the entire repository.\n\n## Steps to Reproduce\n\n1. Create a personal access token with ONLY read:misc scope\n2. Access: GET /{owner}/{private-repo}/archive/main.tar.gz\n3. Archive is served (200 OK) instead of being rejected (403 Forbidden)\n\nCompare with fixed endpoints:\n- GET /{owner}/{private-repo}/raw/branch/main/README.md correctly returns 403\n\n## Root Cause\n\nDownload function in routers/web/repo/repo.go:372 does not call checkDownloadTokenScope. The outer group middleware reqUnitCodeReader checks repository permission but not token scope.\n\nThe API equivalent (/api/v1/repos/{owner}/{repo}/archive/*) IS properly scoped via tokenRequiresScopes(AccessTokenScopeCategoryRepository). The git HTTP endpoints are scoped via CheckRepoScopedToken in httpBase.\n\n## Suggested Fix\n\nAdd checkDownloadTokenScope(ctx) to Download and InitiateDownload in routers/web/repo/repo.go. The function already exists in routers/web/repo/download.go (same package).\n\n## Discovery Method\n\nVariant analysis of PR #37698 — reviewed all web routes with webAuth.AllowOAuth2 middleware.","state":0,"publishedAt":"2026-06-16T23:42:04+00:00","modifiedAt":"2026-06-25T19:56:32.2871556+00:00","affected":[{"ecosystem":"Go","name":"code.gitea.io/gitea","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.26.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-cr4g-f395-h25h","https://github.com/go-gitea/gitea"],"sourceUrl":"https://github.com/advisories/GHSA-cr4g-f395-h25h","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-cr4g-f395-h25h","identifiers":["GHSA-cr4g-f395-h25h","CVE-2026-20706","GO-2026-5334"]},"retained":false,"historicalAffected":[]}],"coverage":[]}