PT-2026-50134 · Go · Code.Gitea.Io/Gitea
Published
2026-06-16
·
Updated
2026-06-16
·
CVE-2026-20706
CVSS v4.0
5.3
Medium
| Vector | AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N |
Summary
PR #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.
A 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.
Impact
Scope 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.
Steps to Reproduce
- Create a personal access token with ONLY read:misc scope
- Access: GET /{owner}/{private-repo}/archive/main.tar.gz
- Archive is served (200 OK) instead of being rejected (403 Forbidden)
Compare with fixed endpoints:
- GET /{owner}/{private-repo}/raw/branch/main/README.md correctly returns 403
Root Cause
Download function in routers/web/repo/repo.go:372 does not call checkDownloadTokenScope. The outer group middleware reqUnitCodeReader checks repository permission but not token scope.
The API equivalent (/api/v1/repos/{owner}/{repo}/archive/*) IS properly scoped via tokenRequiresScopes(AccessTokenScopeCategoryRepository). The git HTTP endpoints are scoped via CheckRepoScopedToken in httpBase.
Suggested Fix
Add checkDownloadTokenScope(ctx) to Download and InitiateDownload in routers/web/repo/repo.go. The function already exists in routers/web/repo/download.go (same package).
Discovery Method
Variant analysis of PR #37698 — reviewed all web routes with webAuth.AllowOAuth2 middleware.
Fix
Incorrect Authorization
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Weakness Enumeration
Related Identifiers
Affected Products
Code.Gitea.Io/Gitea