{"id":"CVE-2026-28699","revision":null,"records":[{"revision":"10c26090ee4443ae937998e407966be7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-28699","aliases":[],"title":"Gitea Basic Auth bypasses OAuth2 access token scopes","description":"Gitea versions up to and including 1.26.1 allow OAuth2 access token scope enforcement to be bypassed through HTTP Basic authentication.","state":0,"publishedAt":"2026-07-03T20:19:38.663+00:00","modifiedAt":"2026-07-06T15:18:39.782+00:00","affected":[{"ecosystem":"Vendor product","name":"Gitea Open Source Git Server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Gitea\",\n                    \"product\": \"Gitea Open Source Git Server\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"1.26.1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1,"severity":"HIGH"}],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-9r5x-wg6m-x2rc","https://github.com/go-gitea/gitea/pull/37503","https://github.com/go-gitea/gitea/releases/tag/v1.26.2","https://blog.gitea.com/release-of-1.26.2/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-28699","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-28699","identifiers":["CVE-2026-28699"]},"retained":false,"historicalAffected":[]},{"revision":"29a9ee6520ed46b8956ec1183efc61d2","observedAt":"2026-11-07T06:34:02.298+00:00","statement":{"source":"euvd","id":"EUVD-2026-41640","aliases":["CVE-2026-28699","GHSA-9r5x-wg6m-x2rc"],"title":"Gitea versions up to and including 1.26.1 allow OAuth2 access token scope enforcement to be bypassed through HTTP Basic authentication.","description":"Gitea versions up to and including 1.26.1 allow OAuth2 access token scope enforcement to be bypassed through HTTP Basic authentication.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1,"severity":null}],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-9r5x-wg6m-x2rc","https://github.com/go-gitea/gitea/pull/37503","https://github.com/go-gitea/gitea/releases/tag/v1.26.2","https://blog.gitea.com/release-of-1.26.2/"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-41640","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jul 3, 2026, 8:19:38 PM","dateUpdated":"Jul 6, 2026, 3:18:39 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-28699","identifiers":["CVE-2026-28699"]},"retained":false,"historicalAffected":[]},{"revision":"9c915c76c2854e8dbb3defe319e48d46","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-9r5x-wg6m-x2rc","aliases":["CVE-2026-28699","GO-2026-5299"],"title":"Gitea: OAuth2 access token scope enforcement bypass via HTTP Basic authentication","description":"### Summary\n\nGitea fails to enforce OAuth2 access token scopes when the token is submitted via HTTP Basic authentication instead of a Bearer token. An OAuth2 application granted only `read:user` can use the same token as `Authorization: Basic base64(<token>:x-oauth-basic)` and perform write actions, including modifying profiles, adding email addresses, creating repositories, and deleting repositories as the authorizing user.\n\n### Details\n\n**Root cause:** `services/auth/basic.go` accepts OAuth2 access tokens through the Basic auth path but does not store the token scope in the request context:\n\n```go\n// services/auth/basic.go\nif uid != 0 {\n    store.GetData()[\"LoginMethod\"] = OAuth2TokenMethodName\n    store.GetData()[\"IsApiToken\"] = true   // scope is NOT set\n    return u, nil\n}\n```\n\nThe scope enforcement middleware in `routers/api/v1/api.go` exits early when `ApiTokenScope` is absent:\n\n```go\n// routers/api/v1/api.go — tokenRequiresScopes\nscope, scopeExists := ctx.Data[\"ApiTokenScope\"].(auth_model.AccessTokenScope)\nif ctx.Data[\"IsApiToken\"] != true || !scopeExists {\n    return   //<- exits without checking scope, all actions permitted\n}\n```\n\nWhen a token arrives via Bearer, `ApiTokenScope` is populated and scope checks apply normally. When the same token arrives via Basic auth, `ApiTokenScope` is never set, so `tokenRequiresScopes` returns immediately and no scope is enforced.\n\n**Suggested fix:** When an OAuth2 access token is accepted in `services/auth/basic.go`, populate `ApiTokenScope` in the request context identically to the Bearer-token OAuth2 path.\n\n### PoC\n\n1. Create an OAuth2 application in Gitea.\n2. Authorize it as a normal user with scope `read:user` only.\n3. Take the resulting access token and call a write endpoint both ways:\n\n**Bearer | correctly blocked:**\n```\nAuthorization: Bearer <token>\nPATCH /api/v1/user/settings  ->  403 Forbidden\n```\n\n**Basic | bypass:**\n```\nAuthorization: Basic base64(<token>:x-oauth-basic)\nPATCH /api/v1/user/settings  ->  200 OK\n```\n\n**All verified bypass endpoints using a `read:user`-only token:**\n\n| Endpoint | Bearer | Basic |\n|---|---|---|\n| `PATCH /api/v1/user/settings` | 403 | 200 |\n| `POST /api/v1/user/emails` | 403 | 200 |\n| `POST /api/v1/user/repos` | 403 | 200 |\n| `PATCH /api/v1/repos/{owner}/{repo}` | 403 | 200 |\n| `DELETE /api/v1/repos/{owner}/{repo}` | 403 | 200 |\n\nThe bypass respects the user's normal repository permissions, it does not grant access to repositories the user cannot otherwise reach, and does not escalate to admin.\n\n### Impact\n\nAny OAuth2 application with any restricted scope can silently operate beyond its granted permissions by switching from Bearer to Basic auth. An attacker who obtains a token (e.g. via a malicious OAuth2 app a user authorized) can:\n\n- Modify the victim's profile and settings\n- Add attacker-controlled email addresses to the victim's account\n- Create repositories as the victim\n- Modify or delete the victim's private repositories\n\nThe entire OAuth2 scope system is effectively bypassed for any token submitted via Basic auth.","state":0,"publishedAt":"2026-06-16T23:40:34+00:00","modifiedAt":"2026-06-25T19:56:25.9257474+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_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-9r5x-wg6m-x2rc","https://github.com/go-gitea/gitea"],"sourceUrl":"https://github.com/advisories/GHSA-9r5x-wg6m-x2rc","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-9r5x-wg6m-x2rc","identifiers":["GHSA-9r5x-wg6m-x2rc","CVE-2026-28699","GO-2026-5299"]},"retained":false,"historicalAffected":[]},{"revision":"e3c9fd84b4774234a66ca31c9a920995","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5299","aliases":["CVE-2026-28699","GHSA-9r5x-wg6m-x2rc"],"title":"Gitea: OAuth2 access token scope enforcement bypass via HTTP Basic authentication in code.gitea.io/gitea","description":"Gitea: OAuth2 access token scope enforcement bypass via HTTP Basic authentication in code.gitea.io/gitea","state":0,"publishedAt":"2026-06-25T18:43:19+00:00","modifiedAt":"2026-06-25T19:45:30.5482764+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":[],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-9r5x-wg6m-x2rc"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5299","license":"OSV · upstream source license applies","key":"osv:GO-2026-5299","identifiers":["GO-2026-5299","CVE-2026-28699","GHSA-9r5x-wg6m-x2rc"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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