What’s Vulnerable › Vulnerabilities

CVE-2026-86035: Weblate: Mercurial argument injection via repository filenames allows authenticated command execution

• Severity: high (CVSS 8.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-29 · updated 2026-10-02
• Weakness: CWE-78

Description

Weblate 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.

Affected products

• WeblateOrg weblate: from 4.11.1, < 2026.8

References

• https://github.com/WeblateOrg/weblate/commit/f60a9759a6d851bd10ccdefe9b1b7f0cdb9e9bbd
• https://github.com/WeblateOrg/weblate/pull/20768
• https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.8
• https://github.com/WeblateOrg/weblate/security/advisories/GHSA-327h-qqgm-qv55

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