{"id":"CVE-2026-20706","title":"Gitea: Token scope bypass on web archive download endpoint","summary":"Gitea: Token scope bypass on web archive download endpoint","severity":"medium","cwe":["CWE-863"],"vendor":"gitea","product":"code.gitea.io/gitea","ecosystem":"go","affected":["code.gitea.io/gitea <= 1.26.1"],"patched":["code.gitea.io/gitea 1.26.2"],"published":"2026-06-16","updated":"2026-06-16","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-cr4g-f395-h25h","references":[{"url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-cr4g-f395-h25h"},{"url":"https://github.com/advisories/GHSA-cr4g-f395-h25h"}],"tags":["ghsa","go"],"ingestedAt":"2026-06-29T14:31:47.454Z","epss":0.00565,"epssPercentile":0.45703,"slug":"CVE-2026-20706","body":"## Overview\n\n## 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.\n\n## Affected packages\n\n- `code.gitea.io/gitea <= 1.26.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `code.gitea.io/gitea 1.26.2`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}