Auth bypass in Weblate
CVE-2026-27457
Weblate is a web based localization tool. Prior to version 5.16.1, the REST API's `AddonViewSet` (`weblate/api/views.py`, line 2831) uses `queryset = Addon.objects.all()` without overriding `get_queryset()` to scope results by user permissions. This allows any authenticated user (or anonymous users if `REQUIRE_LOGIN` is not set) to list and retrieve ALL addons across all projects and components via `GET /api/addons/` and `GET /api/addons/{id}/`. Version 5.16.1 fixes the issue.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Weblate
- Weblateorg Weblate — versions < 5.16.1
Weakness classification (CWE)
References
- github.com/WeblateOrg/weblate/security/advisories/GHSA-wppc-7cq7-cgfv (Patch, Vendor Advisory)
- github.com/WeblateOrg/weblate/pull/18107 (Patch, Issue Tracking)
- github.com/WeblateOrg/weblate/pull/18164 (Patch, Issue Tracking)
- github.com/WeblateOrg/weblate/commit/3f58f9a4152bc0cbdd6eff5954f9c7bc4d9f0af9 (Patch)
- github.com/WeblateOrg/weblate/commit/7802c9b121eb407c48d4adddd4f2458fb3efef0f (Patch)
- github.com/WeblateOrg/weblate/releases/tag/weblate-5.16.1 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-27457?
- CVE-2026-27457 is a medium-severity vulnerability in Weblate, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-02-26.
- How severe is CVE-2026-27457?
- Medium severity. CVSS v3 base score is 4.3 out of 10.