What’s Vulnerable › Vulnerabilities

CVE-2026-27457: Weblate: Missing access control for the AddonViewSet API exposes all addon configurations

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-26 · updated 2026-06-17
• Weakness: CWE-200

Description

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.

Affected products

• WeblateOrg weblate: before 5.16.1 — fixed in 5.16.1

How to fix

Upgrade to a fixed version: WeblateOrg weblate 5.16.1. Check the vendor advisory for mitigations.

References

• https://github.com/WeblateOrg/weblate/commit/3f58f9a4152bc0cbdd6eff5954f9c7bc4d9f0af9
• https://github.com/WeblateOrg/weblate/commit/7802c9b121eb407c48d4adddd4f2458fb3efef0f
• https://github.com/WeblateOrg/weblate/pull/18107
• https://github.com/WeblateOrg/weblate/pull/18164
• https://github.com/WeblateOrg/weblate/releases/tag/weblate-5.16.1
• https://github.com/WeblateOrg/weblate/security/advisories/GHSA-wppc-7cq7-cgfv

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