CVE-2025-13822: MCPHub Authentication Bypass Vulnerability

CVE-2025-13822 Overview

CVE-2025-13822 is an authentication bypass vulnerability affecting MCPHub in versions below 0.11.0. The vulnerability exists because certain endpoints lack proper authentication middleware protection, enabling unauthenticated attackers to perform actions in the context of other users and abuse their privileges. This flaw falls under CWE-639 (Authorization Bypass Through User-Controlled Key), indicating that the application fails to properly verify authorization before processing sensitive requests.

Critical Impact

Unauthenticated attackers can bypass authentication controls and perform privileged actions as other users, potentially leading to account takeover and unauthorized data access.

Affected Products

• MCPHub versions below 0.11.0

Discovery Timeline

• 2026-04-14 - CVE CVE-2025-13822 published to NVD
• 2026-04-14 - Last updated in NVD database

Technical Details for CVE-2025-13822

Vulnerability Analysis

This authentication bypass vulnerability in MCPHub stems from inconsistent application of authentication middleware across the application's endpoints. While some endpoints are properly protected, others remain exposed without any authentication checks. This architectural oversight allows attackers on the adjacent network to submit requests directly to unprotected endpoints, effectively impersonating authenticated users without providing valid credentials.

The vulnerability is particularly concerning because it enables horizontal privilege escalation, where an attacker can assume the identity of any user within the system. By exploiting unprotected API endpoints, attackers can perform actions such as modifying user data, accessing sensitive information, or executing privileged operations that should require authentication.

Root Cause

The root cause of CVE-2025-13822 is the incomplete implementation of authentication middleware across MCPHub's endpoint architecture. The development team failed to apply consistent access controls to all sensitive endpoints, leaving gaps that attackers can exploit. This represents a common misconfiguration where authentication is applied selectively rather than as a default-deny policy across all routes.

Attack Vector

The attack vector requires adjacent network access, meaning the attacker must be on the same local network segment as the vulnerable MCPHub instance. From this position, an attacker can identify unprotected endpoints through reconnaissance and directly submit crafted requests without authentication tokens. The attack requires no user interaction and can be executed with low complexity, as the attacker simply needs to discover and access the unprotected endpoints to impersonate legitimate users.

The exploitation process involves identifying endpoints that bypass authentication middleware, then crafting requests that specify target user identifiers to perform actions in their context. For detailed technical analysis, refer to the CERT Security Advisory for CVE-2025-13822.

Detection Methods for CVE-2025-13822

Indicators of Compromise

• Unusual API requests to MCPHub endpoints without corresponding authentication tokens or session cookies
• Server logs showing successful operations from IP addresses that lack prior authentication events
• Anomalous user activity patterns where actions are attributed to users who were not actively logged in
• Multiple requests manipulating different user accounts from a single source IP address

Detection Strategies

• Implement logging for all authentication bypass attempts and failed authentication events at the application layer
• Monitor for requests to sensitive endpoints that lack proper authorization headers
• Deploy network intrusion detection rules to identify reconnaissance patterns targeting MCPHub API endpoints
• Correlate user activity logs with authentication events to identify discrepancies

Monitoring Recommendations

• Enable verbose logging on MCPHub instances to capture all incoming requests and their authentication status
• Set up alerts for API access patterns that bypass normal authentication flows
• Monitor for sudden changes in user account permissions or data without corresponding authenticated sessions
• Review access logs regularly for requests originating from unexpected network segments

How to Mitigate CVE-2025-13822

Immediate Actions Required

• Upgrade MCPHub to version 0.11.0 or later immediately
• Audit all MCPHub endpoints to ensure authentication middleware is consistently applied
• Review access logs for signs of unauthorized access or privilege abuse
• Restrict network access to MCPHub instances to trusted segments only until patching is complete

Patch Information

The vulnerability has been addressed in MCPHub version 0.11.0. Organizations should upgrade to this version or later to remediate the authentication bypass issue. The fix ensures that authentication middleware is properly applied to all sensitive endpoints, preventing unauthenticated access.

For additional information, refer to the MCPHub GitHub repository and the CERT Security Advisory.

Workarounds

• Implement network-level access controls to restrict MCPHub access to trusted IP addresses only
• Deploy a reverse proxy or API gateway in front of MCPHub that enforces authentication for all requests
• Disable or restrict access to non-essential MCPHub endpoints until the patch can be applied
• Monitor and log all access to MCPHub instances to detect potential exploitation attempts

# Example: Restrict network access using iptables (temporary workaround)
# Allow only trusted network segment to access MCPHub
iptables -A INPUT -p tcp --dport 8080 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP