CVE-2026-51994

State: Published
Severity: 9.1 Critical
Published: Sep 24, 2026
Updated: Sep 25, 2026
Reserved: Jun 8, 2026

Description

mcp-remote versions 0.1.32 through 0.1.38 are vulnerable to Server-Side Request Forgery (SSRF) via the resource_metadata URL extracted from a remote MCP server's WWW-Authenticate header

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	CISA-ADP

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
n/an/a	n/aAffected

References

https://github.com/geelen/mcp-remote
https://github.com/geelen/mcp-remote/security/advisories
https://github.com/playb0t/mcp-remote-oauth-security#readme
https://github.com/playb0t/mcp-remote-oauth-security/blob/v1.0.1/advisories/F-01-resource-metadata-ssrf.md

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