Argument Injection Vulnerability in Weblate Localization Platform
CVE-2026-86035

8.5HIGH

Key Information:

Vendor

Weblateorg

Status
Weblate
Vendor
CVE Published:
29 September 2026

What is CVE-2026-86035?

Weblate, a popular web-based continuous localization platform for managing software translations, is affected by an argument injection vulnerability in its Mercurial backend. This flaw, present in versions from 4.11.1 to 2026.7.1, enables that repository filenames starting with '-' can be misinterpreted as Mercurial options rather than literal paths. An authenticated user possessing project-scoped component.edit permissions can exploit this vulnerability via a Mercurial-backed RESX component using the Update RESX files add-on. A subsequent repository update might lead to the execution of arbitrary commands with the privileges of the Weblate service account. This issue stems from an incomplete fix related to a previous vulnerability and has been addressed in Weblate version 2026.8.

Affected Version(s)

weblate >= 4.11.1, < 2026.8

References

https://github.com/WeblateOrg/weblate/security/advisories...
x_refsource_CONFIRM
https://github.com/WeblateOrg/weblate/pull/20768
x_refsource_MISC
https://github.com/WeblateOrg/weblate/commit/f60a9759a6d8...
x_refsource_MISC

CVSS V3.1

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.