CVE-2026-7417: Algovate xhs-mcp SSRF Vulnerability

CVE-2026-7417 Overview

A Server-Side Request Forgery (SSRF) vulnerability has been identified in Algovate xhs-mcp version 0.8.11. This security flaw exists within the xhs_publish_content function located in the src/server/mcp.server.ts file of the MCP Interface component. The vulnerability allows remote attackers to manipulate the media_paths argument to force the server to make unauthorized requests to arbitrary internal or external resources.

Critical Impact
This SSRF vulnerability enables attackers to bypass network security controls, access internal services, and potentially exfiltrate sensitive data from systems that should not be publicly accessible. The exploit has been publicly disclosed and the vendor has not yet responded to responsible disclosure attempts.

Affected Products

Algovate xhs-mcp version 0.8.11
MCP Interface component (src/server/mcp.server.ts)
Systems utilizing the xhs_publish_content function with unvalidated media_paths input

Discovery Timeline

2026-04-29 - CVE-2026-7417 published to NVD
2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-7417

Vulnerability Analysis

The vulnerability resides in the xhs_publish_content function within the MCP (Model Context Protocol) Interface of the xhs-mcp application. This function fails to properly validate and sanitize user-supplied input in the media_paths argument before using it to construct server-side requests.

SSRF vulnerabilities (CWE-918) occur when an application fetches remote resources based on user-controlled input without adequate validation. In this case, an attacker can supply malicious URLs through the media_paths parameter, causing the server to make requests to arbitrary destinations. This can be exploited to scan internal networks, access cloud metadata services, interact with internal APIs, or bypass firewall restrictions.

The vulnerability is particularly concerning because it can be exploited remotely without any authentication requirements, making it accessible to any attacker with network access to the vulnerable service.

Root Cause

The root cause of this vulnerability is insufficient input validation in the xhs_publish_content function. The media_paths argument accepts user-controlled URLs or paths without verifying they point to legitimate, expected resources. The application lacks proper URL scheme validation, hostname allowlisting, and protection against requests to internal network addresses or localhost.

Attack Vector

The attack is network-based, requiring no user interaction or prior authentication. An attacker can remotely exploit this vulnerability by sending crafted requests to the MCP Interface with malicious values in the media_paths parameter. The server will then execute requests to attacker-specified destinations, potentially exposing internal services, cloud metadata endpoints, or other sensitive resources.

The exploitation technique involves manipulating the media_paths parameter to include internal URLs such as http://127.0.0.1/, http://169.254.169.254/ (cloud metadata), or internal hostnames. Additional details about the vulnerability and exploitation methods can be found in the GitHub issue discussion and VulDB vulnerability entry.

Detection Methods for CVE-2026-7417

Indicators of Compromise

Unusual outbound HTTP requests from the xhs-mcp server to internal IP ranges (10.x.x.x, 172.16.x.x, 192.168.x.x)
Server requests to cloud metadata endpoints (169.254.169.254)
Unexpected network connections from the MCP Interface to localhost or loopback addresses
Log entries showing xhs_publish_content function calls with suspicious media_paths values containing internal hostnames or IP addresses

Detection Strategies

Monitor application logs for the xhs_publish_content function being called with unusual media_paths containing internal IP addresses or non-standard URL schemes
Implement network-level monitoring to detect outbound requests from the xhs-mcp server to RFC 1918 private address ranges
Configure intrusion detection systems to alert on requests to common SSRF targets such as cloud metadata services
Review HTTP request logs for patterns indicating SSRF probing, including sequential IP scanning or requests to well-known internal service ports

Monitoring Recommendations

Enable verbose logging for the MCP Interface component to capture all media_paths argument values
Deploy network segmentation monitoring to detect unauthorized internal network access attempts from the application server
Implement alerting for any requests from the xhs-mcp service to localhost, private IP ranges, or link-local addresses
Monitor for DNS resolution of internal hostnames initiated by the MCP Interface

How to Mitigate CVE-2026-7417

Immediate Actions Required

Restrict network access to the xhs-mcp MCP Interface to trusted sources only using firewall rules
Implement egress filtering on the server hosting xhs-mcp to prevent outbound requests to internal network ranges
If not required for business operations, disable or remove the xhs_publish_content functionality until a patch is available
Consider placing the vulnerable component behind a web application firewall (WAF) with SSRF protection rules enabled

Patch Information

As of the last NVD update on 2026-04-29, no official patch has been released by the vendor. The project maintainers were notified of this vulnerability through a GitHub issue but have not yet responded. Organizations should monitor the official xhs-mcp repository for security updates and patch releases.

Workarounds

Implement server-side URL validation to enforce an allowlist of permitted domains and URL schemes for the media_paths parameter
Block outbound requests to private IP ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), localhost, and cloud metadata endpoints at the network level
Deploy a reverse proxy in front of the MCP Interface that validates and sanitizes incoming media_paths values before forwarding requests
If modifying the source code is feasible, add hostname and IP address validation to reject requests targeting internal resources

bash

# Example iptables rules to block SSRF to internal networks from the xhs-mcp server
# Block outbound traffic to private IP ranges
iptables -A OUTPUT -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -d 192.168.0.0/16 -j DROP
iptables -A OUTPUT -d 127.0.0.0/8 -j DROP
iptables -A OUTPUT -d 169.254.169.254 -j DROP