Weblate: Mercurial argument injection via repository filenames allows authenticated command execution

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-86035
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-29 15:17:30 UTC
Updated2026-09-30 19:57:08 UTC
DescriptionWeblate is a web-based continuous localization platform used to manage software translations. Weblate 4.11.1 through 2026.7.1 contains an argument-injection vulnerability in its Mercurial backend. Repository filenames beginning with - could be interpreted as Mercurial options instead of literal paths. An authenticated user with project-scoped component.edit permission could exploit this through a Mercurial-backed RESX component using the Update RESX files add-on. A later repository update could execute arbitrary commands with the privileges of the Weblate service account. This is a residual incomplete fix for CVE-2022-23915. This issue has been patched in version 2026.8.

Risk And Classification

Primary CVSS: v3.1 8.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Problem Types: CWE-78 | CWE-88 | CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') | CWE-88 CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA WeblateOrg Weblate affected >= 4.11.1, < 2026.8 Not specified

References

ReferenceSourceLinkTags
github.com/WeblateOrg/weblate/pull/20768 [email protected] github.com
github.com/WeblateOrg/weblate/security/advisories/GHSA-327h-qqgm-qv55 [email protected] github.com
github.com/WeblateOrg/weblate/commit/f60a9759a6d851bd10ccdefe9b1b7f0cdb9... [email protected] github.com
github.com/WeblateOrg/weblate/releases/tag/weblate-2026.8 [email protected] github.com
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