{"id":"CVE-2026-27783","revision":null,"records":[{"revision":"81f9d7d741564ae7a9cfe221bae91650","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-27783","aliases":[],"title":"Gitea issue-template APIs bypass repository unit authorization","description":"Gitea versions up to and including 1.26.1 do not enforce repository-unit authorization on issue-template API endpoints.","state":0,"publishedAt":"2026-07-03T20:19:38.321+00:00","modifiedAt":"2026-07-06T15:19:12.048+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:L/I:N/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-3fwp-p5rj-2pxf","https://github.com/go-gitea/gitea/pull/37769","https://github.com/go-gitea/gitea/pull/37781","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-2026-27783","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-27783","identifiers":["CVE-2026-27783"]},"retained":false,"historicalAffected":[]},{"revision":"15105cecf76f4523bd9ed4f880f2bc61","observedAt":"2026-11-07T13:21:57.624+00:00","statement":{"source":"euvd","id":"EUVD-2026-41639","aliases":["CVE-2026-27783","GHSA-3fwp-p5rj-2pxf"],"title":"Gitea versions up to and including 1.26.1 do not enforce repository-unit authorization on issue-template API endpoints.","description":"Gitea versions up to and including 1.26.1 do not enforce repository-unit authorization on issue-template API endpoints.","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:L/I:N/A:N","score":4.3,"severity":null}],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-3fwp-p5rj-2pxf","https://github.com/go-gitea/gitea/pull/37769","https://github.com/go-gitea/gitea/pull/37781","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-2026-41639","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, 3:19:12 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-41639","identifiers":["EUVD-2026-41639","CVE-2026-27783","GHSA-3fwp-p5rj-2pxf"]},"retained":false,"historicalAffected":[]},{"revision":"1280a789cabc494bb36a22c6c31ddcad","observedAt":"2026-10-27T07:23:32.255+00:00","statement":{"source":"nvd","id":"CVE-2026-27783","aliases":[],"title":"Gitea versions up to and including 1.26.1 do not enforce repository-unit authorization on issue-template API endpoints.","description":"Gitea versions up to and including 1.26.1 do not enforce repository-unit authorization on issue-template API endpoints.","state":0,"publishedAt":"2026-07-03T21:16:59.45+00:00","modifiedAt":"2026-10-25T15:10:00.147+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · 88ee5874-cf24-4952-aea0-31affedb7ff2 · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://blog.gitea.com/release-of-1.26.2/","https://github.com/go-gitea/gitea/pull/37769","https://github.com/go-gitea/gitea/pull/37781","https://github.com/go-gitea/gitea/releases/tag/v1.26.2","https://github.com/go-gitea/gitea/security/advisories/GHSA-3fwp-p5rj-2pxf"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-27783","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-862"],"productCriteria":[],"sourceDates":{"published":"2026-07-03T21:16:59.450","lastModified":"2026-10-25T15:10:00.147"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-27783","identifiers":["CVE-2026-27783"]},"retained":false,"historicalAffected":[]},{"revision":"7ff14b67a4eb424592e3f1f5ce9a730a","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-3fwp-p5rj-2pxf","aliases":["CVE-2026-27783","GO-2026-5081"],"title":"Gitea: Missing repository-unit authorization on issue-template API endpoints","description":"## Summary\n\nThree Gitea API endpoints — `GET /repos/{owner}/{repo}/issue_templates`,\n`GET /repos/{owner}/{repo}/issue_config` and `GET /repos/{owner}/{repo}/issue_config/validate`\n— read files from the repository's **Code** default branch (`.gitea/ISSUE_TEMPLATE/*`\nand `issue_config.yaml`) and return their contents, but are registered **without**\nthe `reqRepoReader(unit.TypeCode)` authorization middleware that every sibling\nCode-tree endpoint in the same route group carries.\n\nA user who has access to a private repository through *any single repository unit*\n(for example an organization team granted only the **Issues** unit, with no Code\naccess) can therefore read the issue-template and issue-config files of that\nrepository's Code tree, which their permission set should not expose.\n\n---\n\n## Root cause\n\n### The three endpoints lack the unit guard\n\n`routers/api/v1/api.go:1433-1437`:\n\n    m.Get(\"/issue_templates\", context.ReferencesGitRepo(), repo.GetIssueTemplates)\n    m.Get(\"/issue_config\", context.ReferencesGitRepo(), repo.GetIssueConfig)\n    m.Get(\"/issue_config/validate\", context.ReferencesGitRepo(), repo.ValidateIssueConfig)\n    m.Get(\"/languages\", reqRepoReader(unit.TypeCode), repo.GetLanguages)\n    m.Get(\"/licenses\", reqRepoReader(unit.TypeCode), repo.GetLicenses)\n\n`context.ReferencesGitRepo()` only opens the git repository — it performs no\npermission check. Every other endpoint in this group that reads Code-tree content\nis guarded with `reqRepoReader(unit.TypeCode)`: `/languages`, `/licenses`,\n`/contents/*`, `/file-contents`, and `/{ball_type:tarball|zipball|bundle}/*`\n(api.go:1418-1445). The three issue-template endpoints are the only Code-tree\nreaders in the group missing that guard.\n\nThe enclosing group runs `repoAssignment()` (api.go:1446), whose access check is\nsatisfied by `HasAnyUnitAccessOrPublicAccess` — i.e. access to **any** unit of the\nrepository is sufficient to pass. Without a per-unit `reqRepoReader`, the handlers\nrun for a caller who has no Code permission.\n\n### The handlers return Code-tree file contents\n\n`routers/api/v1/repo/repo.go`:\n\n    func GetIssueTemplates(ctx *context.APIContext) {                       // :1179\n        ret := issue.ParseTemplatesFromDefaultBranch(ctx.Repo.Repository, ctx.Repo.GitRepo)\n        ...\n        ctx.JSON(http.StatusOK, ret.IssueTemplates)\n    }\n\n    func GetIssueConfig(ctx *context.APIContext) {                          // :1209\n        issueConfig, _ := issue.GetTemplateConfigFromDefaultBranch(ctx.Repo.Repository, ctx.Repo.GitRepo)\n        ctx.JSON(http.StatusOK, issueConfig)\n    }\n\n`ParseTemplatesFromDefaultBranch` / `GetTemplateConfigFromDefaultBranch` read\n`.gitea/ISSUE_TEMPLATE/*` and `issue_config.yaml` from the default (Code) branch\nand return them in the JSON response.\n\n---\n\n## Proof of Concept\n\n`victim-org/private-repo` is a private repository. The attacker is a member of an\norganization team granted access to that repository through a non-Code unit only\n(e.g. the Issues unit) — a supported Gitea permission configuration.\n\n    GET /api/v1/repos/victim-org/private-repo/issue_templates HTTP/1.1\n    Host: TARGET\n    Authorization: token <attacker token>\n\nThe response is `200 OK` with the parsed contents of the repository's\n`.gitea/ISSUE_TEMPLATE/*` files. The same applies to `/issue_config`. Because the\ncaller lacks the Code unit, every other Code-tree endpoint\n(`/contents`, `/languages`, …) correctly returns `404`/`403` for the same token —\nonly these three return data.\n\n---\n\n## Impact\n\nA repository collaborator whose granted permissions exclude the Code unit can read\nthe issue-template and issue-config files from the Code default branch of a private\nrepository. The exposure is limited to those specific configuration files (not\narbitrary Code-tree content), which is why this is rated low impact. It is\nnonetheless a unit-level authorization bypass: the endpoints disclose Code-unit\ncontent to callers the permission model is meant to exclude.\n\n---\n\n## Suggested fix\n\nAdd the same unit guard the sibling endpoints use, in `routers/api/v1/api.go`:\n\n    m.Get(\"/issue_templates\", reqRepoReader(unit.TypeCode), context.ReferencesGitRepo(), repo.GetIssueTemplates)\n    m.Get(\"/issue_config\", reqRepoReader(unit.TypeCode), context.ReferencesGitRepo(), repo.GetIssueConfig)\n    m.Get(\"/issue_config/validate\", reqRepoReader(unit.TypeCode), context.ReferencesGitRepo(), repo.ValidateIssueConfig)\n\n(If issue templates are intended to be visible to Issues-unit users for issue\ncreation, `reqRepoReader(unit.TypeIssues)` is the appropriate guard — but the\ncurrent absence of any unit guard is the bug.)\n\n---\n\n## References\n\n- CWE-862 Missing Authorization\n- CWE-284 Improper Access Control\n- OWASP A01:2021 Broken Access Control","state":0,"publishedAt":"2026-06-16T23:41:42+00:00","modifiedAt":"2026-06-25T18:56:13.6585123+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:L/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/go-gitea/gitea/security/advisories/GHSA-3fwp-p5rj-2pxf","https://github.com/go-gitea/gitea"],"sourceUrl":"https://github.com/advisories/GHSA-3fwp-p5rj-2pxf","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-3fwp-p5rj-2pxf","identifiers":["GHSA-3fwp-p5rj-2pxf","CVE-2026-27783","GO-2026-5081"]},"retained":false,"historicalAffected":[]},{"revision":"d173b43012c54c0f9cbd5731745fcc66","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5081","aliases":["CVE-2026-27783","GHSA-3fwp-p5rj-2pxf"],"title":"Gitea: Missing repository-unit authorization on issue-template API endpoints in code.gitea.io/gitea","description":"Gitea: Missing repository-unit authorization on issue-template API endpoints in code.gitea.io/gitea","state":0,"publishedAt":"2026-06-25T18:26:48+00:00","modifiedAt":"2026-06-25T18:45:16.5017468+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-3fwp-p5rj-2pxf"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5081","license":"OSV · upstream source license applies","key":"osv:GO-2026-5081","identifiers":["GO-2026-5081","CVE-2026-27783","GHSA-3fwp-p5rj-2pxf"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-07T20:52:46.7845564+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-07T20:52:46.7845564+00:00","lastSuccessAt":"2026-11-07T20:52:46.9707302+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:52:46.9707321+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-bb5c9d5a08063ef076042e33dd72a7d0ffa4c4487efdcf3106e29ba55ec2ad57-1766179264875bb4621a23ce4c6bcebec63fb794a16e35c2f5592f4ee300ee2e","complete":true,"records":420944,"lastAttemptAt":"2026-11-07T20:52:46.1142943+00:00","lastSuccessAt":"2026-11-07T20:52:46.0341312+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:52:46.1142943+00:00","snapshotPublishedAt":"2026-11-07T20:26:36+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-cbfb00168958467aaa6015d5230faa08","complete":true,"records":13633,"lastAttemptAt":"2026-11-07T21:04:54.6100336+00:00","lastSuccessAt":"2026-11-07T21:04:54.606+00:00","error":null,"lastVerifiedAt":"2026-11-07T21:04:54.606+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-07T20:52:46.7845564+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-07T20:52:46.7845564+00:00","lastSuccessAt":"2026-11-07T20:52:47.1482288+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:52:47.1482303+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-b9464f9c589b4886928e7045b5ad1e11","complete":true,"records":13645,"lastAttemptAt":"2026-11-07T20:52:54.6850231+00:00","lastSuccessAt":"2026-11-07T20:52:54.68+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:52:54.68+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-0eb4d6dde62dffacd040ad992d4fd5a65cd7d0dc5f5f4cfa8b41967fc6f9ca5f","complete":true,"records":9914,"lastAttemptAt":"2026-11-07T20:52:46.6024506+00:00","lastSuccessAt":"2026-11-06T20:10:36.6450506+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:52:46.6024506+00:00","snapshotPublishedAt":"2026-11-06T20:02:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-07T20:52:46.3552169+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:52:46.3552169+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-335633e78a15c9cde10a6025895b5617717087fb945489ae7e15d377bacf34a9","complete":true,"records":3055,"lastAttemptAt":"2026-11-07T20:52:46.7261257+00:00","lastSuccessAt":"2026-11-06T16:03:00.7615789+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:52:46.7261257+00:00","snapshotPublishedAt":"2026-11-06T16:02:48+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-40ad6183a951565ace1520a9b4d631e1d0bfb1d4bf7c5574c375032559f3ff53","complete":true,"records":231292,"lastAttemptAt":"2026-11-07T20:52:46.4923243+00:00","lastSuccessAt":"2026-11-07T10:29:00.4821259+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:52:46.4923243+00:00","snapshotPublishedAt":"2026-11-07T09:32:47+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}