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Weblate: Missing access control for the AddonViewSet API exposes all addon configurations

Moderate severity GitHub Reviewed Published Feb 26, 2026 in WeblateOrg/weblate • Updated Feb 27, 2026

Package

pip weblate (pip)

Affected versions

< 5.16.1

Patched versions

5.16.1

Description

Impact

Users were able to obtain add-on configuration via API.

Patches

References

Weblate thanks @lighthousekeeper1212 for responsible disclosure.

References

@nijel nijel published to WeblateOrg/weblate Feb 26, 2026
Published to the GitHub Advisory Database Feb 26, 2026
Reviewed Feb 26, 2026
Published by the National Vulnerability Database Feb 26, 2026
Last updated Feb 27, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(7th percentile)

Weaknesses

Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Learn more on MITRE.

Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Learn more on MITRE.

CVE ID

CVE-2026-27457

GHSA ID

GHSA-wppc-7cq7-cgfv

Source code

Credits

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