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CVE-2026-40256

Weblate: Prefix-Based Repository Boundary Check Bypass via Symlink/Junction Path Prefix Collision

Published: Apr 15, 2026Updated: Apr 21, 2026 Sources: CVE List NVDCWE-22
5.0MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 76.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Weblate is a web based localization tool. In versions prior to 5.17, repository-boundary validation relies on string prefix checks on resolved absolute paths. In multiple code paths, the check uses startswith against the repository root path. This is not path-segment aware and can be bypassed when the external path shares the same string prefix as the repository path (for example, repo and repo_outside). This issue has been fixed in version 5.17.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-22

Affected Products

weblateweblate
On-prem
Enterprise Software
weblateWeblateOrg
On-prem
DevTools & CI / source-control
weblatecommercialEnterprise Software
weblateorgoss-projectCZDevTools & CIaka weblate, wlc

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/WeblateOrg/weblate/commit/e30dbcb33ae78e754ecef192d54f996b89cb4e15
github.com
https://github.com/WeblateOrg/weblate/security/advisories/GHSA-ffgh-3jrf-8wvh
github.com

Timeline

Published
Apr 15, 2026
Last Updated
Apr 21, 2026

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