---
title: "CVE-2026-51994: mcp-remote - Server-Side Request Forgery"
description: "mcp-remote 0.1.32 through 0.1.38 contains a server-side request forgery caused by processing the resource_metadata URL from a remote MCP server's WWW-Authenticate header, letting attackers make arbitrary server requests, exploit requires crafted header from remote server."
url: https://panop.io/threat-heartbeat/CVE-2026-51994/
---

# CVE-2026-51994 mcp-remote - Server-Side Request Forgery

mcp-remote 0.1.32 through 0.1.38 contains a server-side request forgery caused by processing the resource\_metadata URL from a remote MCP server's WWW-Authenticate header, letting attackers make arbitrary server requests, exploit requires crafted header from remote server.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

Proof of concept available

EPSS

0.35% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-51994)

## Details

Type

Server-Side Request Forgery

Impact

Server Side Request Forgery

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Published

24 September 2026

Updated

15 October 2026

Weakness

[CWE-918](https://cwe.mitre.org/data/definitions/918.html)

## Vendor fix

Update to a version later than 0.1.38 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-51994](https://nvd.nist.gov/vuln/detail/CVE-2026-51994)
- [https://github.com/geelen/mcp-remote](https://github.com/geelen/mcp-remote)
- [https://github.com/geelen/mcp-remote/security/advisories](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#readme)
- [https://github.com/playb0t/mcp-remote-oauth-security/blob/v1.0.1/advisories/F-01-resource-metadata-ssrf.md](https://github.com/playb0t/mcp-remote-oauth-security/blob/v1.0.1/advisories/F-01-resource-metadata-ssrf.md)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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