go-gitea/gitea · Security

Gitea CVE-2026-20800 sibling endpoints not covered: revoked user still reads private repo objects via `/api/v1/user/starred` and private issue titles via `/api/v1/user/times`

GHSA ID
GHSA-qf2f-qh6p-7v89
CVE ID
CVE-2026-59766
Severity
medium
Published
Updated
CVSS
4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v3
4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Description

Summary

CVE-2026-20800 fixed private-info leakage to revoked users only for the notification endpoint. Two sibling endpoints that return data keyed on the caller's own relationship still do not re-check repo access at output time:

  • GET /api/v1/user/starred — getStarredRepos() computes a per-repo permission but still lists every starred repo (no filtering), so the full repo object (full_name, private, clone_url, ssh_url) of a now-inaccessible private repo is returned.
  • GET /api/v1/user/times — ListMyTrackedTimes() queries by UserID only and LoadAttributes brings in the issue (title, state), leaking private issue titles after revocation.

Steps to reproduce

Using the provided reproduction materials, as a revoked user:

  1. Control: GET /api/v1/repos/admin/starred-test → 404.
  2. GET /api/v1/user/starred → leaks admin/starred-test, private:true, clone_url.
  3. GET /api/v1/user/times → leaks issue.title = "SECRET: …", state.

(Runtime-confirmed on gitea/gitea:1.25.4. Oracle = planted sentinel title; no real secret exfiltrated.)

Impact

A former collaborator can enumerate private repos they starred and read private issue titles they logged time on, indefinitely after access revocation. Metadata only (no repo content / comment bodies). Low.

Suggested remediation

  1. getStarredRepos: drop (or minimally redact) repos where permission.HasAnyUnitAccessOrPublicAccess() is false for the caller.
  2. ListMyTrackedTimes: filter tracked-time entries by current repo access.
  3. Optionally clear a user's stars / time entries for a private repo on revocation.

Credit

Reported as part of an incomplete-patch measurement study (responsible disclosure).

CWEs

References