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CVE-2026-40256— Weblate: Prefix-Based Repository Boundary Check Bypass via Symlink/Junction Path Prefix Collision

Quick assessment

Affected
WeblateOrg weblate
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Weblate是Weblate开源的一个 Copyleft 的基于 web 的自由软件持续本地化系统。 Weblate 5.17之前版本存在安全漏洞，该漏洞源于存储库边界验证存在绕过问题，可能导致路径遍历。

CVSS 5.0 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40256

Vulnerability Information
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Vulnerability Title
Weblate: Prefix-Based Repository Boundary Check Bypass via Symlink/Junction Path Prefix Collision
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Weblate 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Weblate是Weblate开源的一个 Copyleft 的基于 web 的自由软件持续本地化系统。 Weblate 5.17之前版本存在安全漏洞，该漏洞源于存储库边界验证存在绕过问题，可能导致路径遍历。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WeblateOrg weblate < 5.17 -

II. Public POCs for CVE-2026-40256

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III. Intelligence Information for CVE-2026-40256

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Patches & Fixes for CVE-2026-40256 (1)

Same Patch Batch · WeblateOrg · 2026-04-15 · 10 CVEs total

CVE-2026-34393 8.8 HIGH Weblate: Privilege escalation in the user API endpoint
CVE-2026-33435 8.1 HIGH Weblate: Remote code execution during backup restoration
CVE-2026-34242 7.7 HIGH Weblate: Arbitrary File Read via Symlink
CVE-2026-33220 6.8 MEDIUM Weblate: JavaScript localization CDN add-on allows arbitrary local file read outside the r
CVE-2026-34244 5.0 MEDIUM Weblate: SSRF via Project-Level Machinery Configuration
CVE-2026-33440 5.0 MEDIUM Weblate: Authenticated SSRF via redirect bypass of ALLOWED_ASSET_DOMAINS in screenshot URL
CVE-2026-33214 4.3 MEDIUM Weblate has improper access control for the translation memory API
CVE-2026-39845 4.1 MEDIUM Weblate: SSRF via the webhook add-on using unprotected fetch_url()
CVE-2026-33212 3.1 LOW Weblate: Improper access control for pending tasks in API

IV. Related Vulnerabilities

Same product: weblate
Same vendor: WeblateOrg
Same weakness: CWE-22

V. Comments for CVE-2026-40256

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