Bitbonsai MCPVault up to 0.11.3 PathFilter src/pathfilter.ts isAllowed/isAllowedForListing access control

Summaryinfo

A vulnerability described as critical has been identified in Bitbonsai MCPVault up to 0.11.3. This issue affects the function isAllowed/isAllowedForListing of the file src/pathfilter.ts of the component PathFilter. The manipulation results in access control. This vulnerability is known as CVE-2026-57441. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Bitbonsai MCPVault up to 0.11.3. It has been classified as critical. Affected is the function isAllowed/isAllowedForListing of the file src/pathfilter.ts of the component PathFilter. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

MCPVault is a lightweight Model Context Protocol server for safe access to files in an Obsidian vault. Prior to 0.11.4, PathFilter in src/pathfilter.ts compiles restricted-directory patterns case-sensitively and compares paths without canonicalizing filesystem-equivalent segment names. On case-insensitive macOS and Windows filesystems, case variants of .git, .obsidian, or node_modules pass both isAllowed() and isAllowedForListing() even though the operating system opens the restricted directory, and Windows trailing dots or spaces provide the same bypass. An attacker who influences a path selected by an AI agent can use the bypass in read, write, move, search, or listing operations to expose or modify sensitive repository and Obsidian metadata. Vault-root .. containment is not affected. This issue is fixed in version 0.11.4.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-57441 since 06/24/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 0.11.4 eliminates this vulnerability.

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Productinfo

Vendor

• Bitbonsai

Name

• MCPVault

Version

• 0.11.0
• 0.11.1
• 0.11.2
• 0.11.3

Website

• Product: https://github.com/bitbonsai/mcpvault/

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