TI-2026-58863 Aliases CVE-2026-86035

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

LOW 39CWE-78Published 2026-09-29 · Updated 2026-10-02

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: High
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00464 40th percentileScored 2026-11-07

Fix Fixed weblate (WeblateOrg): 2026.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
WeblateOrg	weblate	4.11.1 to before 2026.8	2026.8	Patch available	CNA

weblate VendorWeblateOrg Affected 4.11.1 to before 2026.8 Fixed in 2026.8 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:weblate:weblate::::::::	—	—	WeblateOrg

cpe:2.3:a:weblate:weblate:*:*:*:*:*:*:*:* Versions — — ·WeblateOrg

Remediation

Fix · CNA weblate (WeblateOrg) Fixed in 2026.8

Timeline

2026-10-02 Threatist record created from CVE-2026-86035

References

Other 4

TI-2025-23145 Weblate VCS credentials included in URL parameters are potentially logged and saved into browser history as plaintext CVSS 3.1HIGH 7.5
TI-2025-38033 Weblate integration with Anubis can lead to Open Redirect via redir parameter CVSS 4.0LOW 2.1
TI-2022-07893 Remote code execution (RCE) in Weblate CVSS 3.1HIGH 8.8
TI-2025-41967 Weblate has git config file overwrite vulnerability that leads to remote code execution CVSS 3.1CRITICAL 9.1
TI-2026-26679 Weblate: Privilege escalation in the user API endpoint CVSS 3.1HIGH 8.8
TI-2026-19444 Weblate has an argument injection in management console CVSS 3.1CRITICAL 9.1

See all 49 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences