Vulnerability · Published Jul 2, 2025 · Assigned by GitHub_M

CVE-2025-53109Model Context Protocol Servers Vulnerable to Path Validation Bypass via Prefix Matching and Symlink Handling

High 7.3

In plain English

A high-severity security flaw in servers from modelcontextprotocol. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.3High

Exploit odds (30 days)0.8%top 44.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Model Context Protocol Servers is a collection of reference implementations for the model context protocol (MCP). Versions of Filesystem prior to 0.6.4 or 2025.7.01 could allow access to unintended files via symlinks within allowed directories. Users are advised to upgrade to 0.6.4 or 2025.7.01 resolve.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@modelcontextprotocol/server-filesystem	no fix listed	GHSA-q66q-fx2p-7w4m
npm	@modelcontextprotocol/server-filesystem	2025.7.1	GHSA-q66q-fx2p-7w4m

Affected products (as reported)

Vendor	Product	Versions
modelcontextprotocol	servers	< 0.6.4< 2025.7.01

Weakness: CWE-59 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:H/SI:H/SA:H

References

https://github.com/modelcontextprotocol/servers/security/advisories/GHSA-q66q-fx2p-7w4m x_refsource_CONFIRM
https://github.com/modelcontextprotocol/servers/commit/d00c60df9d74dba8a3bb13113f8904407cda594f x_refsource_MISC