CVE-2025-6514: OS command injection in mcp-remote when connecting to untrusted MCP servers

Severity: critical (CVSS 9.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 77.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-09 · updated 2026-06-17
Weakness: CWE-78

Description

mcp-remote is exposed to OS command injection when connecting to untrusted MCP servers due to crafted input from the authorization_endpoint response URL

References

https://github.com/geelen/mcp-remote/commit/607b226a356cb61a239ffaba2fb3db1c9dea4bac
https://jfrog.com/blog/2025-6514-critical-mcp-remote-rce-vulnerability
https://research.jfrog.com/vulnerabilities/mcp-remote-command-injection-rce-jfsa-2025-001290844/

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