CVE-2026-27457
Received Received - Intake
Insecure Direct Object Reference in Weblate Addon API

Publication date: 2026-02-26

Last updated on: 2026-02-27

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2026-02-26
Last Modified
2026-02-27
Generated
2026-06-16
AI Q&A
2026-02-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-27457
EUVD
EUVD-2026-8897
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
weblate weblate to 5.16.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
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Executive Summary

This vulnerability exists in Weblate versions prior to 5.16.1 in the REST API's AddonViewSet. The issue is that the API uses a queryset that retrieves all addons without restricting the results based on user permissions. As a result, any authenticated user, or even anonymous users if login is not required, can list and access all addons across all projects and components.

Impact Analysis

The vulnerability allows unauthorized access to all addons in the Weblate system. This means that users can view addons they should not have access to, potentially exposing sensitive or private information related to various projects and components.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, upgrade Weblate to version 5.16.1 or later, where the issue has been fixed.

Additionally, ensure that the REQUIRE_LOGIN setting is enabled to prevent anonymous users from accessing the API.

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