CVE-2026-86035: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in WeblateOrg weblate
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.
AI Analysis
Technical Summary
CVE-2026-86035 is an OS command injection vulnerability in Weblate's Mercurial backend affecting versions 4.11.1 through 2026.7.1. The vulnerability arises because repository filenames starting with '-' can be interpreted as command-line options by Mercurial instead of literal paths. An authenticated user with component.edit permission scoped to a project can exploit this via a Mercurial-backed RESX component using the Update RESX files add-on. Successful exploitation allows execution of arbitrary commands with the privileges of the Weblate service account. This issue is a residual incomplete fix of CVE-2022-23915 and has been addressed in Weblate version 2026.8.
Potential Impact
An attacker with authenticated access and specific project permissions can execute arbitrary OS commands on the Weblate server with the privileges of the Weblate service account. This can lead to full compromise of the Weblate instance, including confidentiality, integrity, and availability impacts. The CVSS 3.1 score is 8.5 (High), reflecting network attack vector, high impact on confidentiality, integrity, and availability, and requiring low privileges but high attack complexity.
Mitigation Recommendations
Upgrade Weblate to version 2026.8 or later, where this vulnerability has been patched. No other mitigations are indicated by the vendor advisory. Until patched, restrict project-scoped component.edit permissions to trusted users only.
CVE-2026-86035: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in WeblateOrg weblate
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.
CVSS v3.1
Score 8.5high
Affected software
WeblateOrg
weblate
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86035 is an OS command injection vulnerability in Weblate's Mercurial backend affecting versions 4.11.1 through 2026.7.1. The vulnerability arises because repository filenames starting with '-' can be interpreted as command-line options by Mercurial instead of literal paths. An authenticated user with component.edit permission scoped to a project can exploit this via a Mercurial-backed RESX component using the Update RESX files add-on. Successful exploitation allows execution of arbitrary commands with the privileges of the Weblate service account. This issue is a residual incomplete fix of CVE-2022-23915 and has been addressed in Weblate version 2026.8.
Potential Impact
An attacker with authenticated access and specific project permissions can execute arbitrary OS commands on the Weblate server with the privileges of the Weblate service account. This can lead to full compromise of the Weblate instance, including confidentiality, integrity, and availability impacts. The CVSS 3.1 score is 8.5 (High), reflecting network attack vector, high impact on confidentiality, integrity, and availability, and requiring low privileges but high attack complexity.
Mitigation Recommendations
Upgrade Weblate to version 2026.8 or later, where this vulnerability has been patched. No other mitigations are indicated by the vendor advisory. Until patched, restrict project-scoped component.edit permissions to trusted users only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-04T19:29:21.057Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abbd6c7f7a7c541068c0cfa
Added to database: 09/29/2026, 15:18:31 UTC
Last enriched: 09/29/2026, 15:32:45 UTC
Last updated: 09/29/2026, 18:20:12 UTC
Views: 9
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