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Weblate wlc path traversal vulnerability: Unsanitized API slugs in download command

High severity GitHub Reviewed Published Jan 16, 2026 in WeblateOrg/wlc • Updated Jan 16, 2026

Package

pip wlc (pip)

Affected versions

< 1.17.2

Patched versions

1.17.2

Description

Impact

Multi-translation download could write to an arbitrary location when instructed by a crafted server.

Patches

Workarounds

Do not use wlc download with untrusted servers.

References

This issue was reported to us by wh1zee via HackerOne.

References

@nijel nijel published to WeblateOrg/wlc Jan 16, 2026
Published to the GitHub Advisory Database Jan 16, 2026
Reviewed Jan 16, 2026
Published by the National Vulnerability Database Jan 16, 2026
Last updated Jan 16, 2026

Severity

High

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
High
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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:H/PR:L/UI:R/S:C/C:H/I:H/A:H

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.
(9th percentile)

Weaknesses

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Learn more on MITRE.

CVE ID

CVE-2026-23535

GHSA ID

GHSA-mmwx-79f6-67jg

Source code

Credits

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