CVE-2025-11609: Hospital Management System RCE Vulnerability

CVE-2025-11609 Overview

CVE-2025-11609 affects code-projects Hospital Management System 1.0, a PHP-based hospital management application. The flaw resides in the session function of the express-session component, where the secret argument is set to the hard-coded value secret. This constitutes a use of a hard-coded cryptographic key [CWE-320]. An attacker who knows the secret can forge or tamper with session cookies remotely. The exploit has been publicly disclosed, although the vendor classifies exploitation as having high complexity.

Critical Impact

Hard-coded session signing secrets allow remote attackers to forge signed session cookies and undermine session integrity in affected deployments.

Affected Products

• code-projects Hospital Management System 1.0
• express-session middleware configured with the hard-coded secret
• Deployments referencing the fabian:hospital_management_system:1.0 CPE

Discovery Timeline

• 2025-10-11 - CVE-2025-11609 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2025-11609

Vulnerability Analysis

The vulnerability stems from initializing express-session with a static, predictable secret embedded in the application source. The secret parameter is used to sign session ID cookies, ensuring the server can detect tampering. When this value is publicly known, the integrity guarantee of signed cookies collapses. Any party with access to the source code, including the public code-projects distribution, learns the signing key. The flaw is categorized under [CWE-320] Key Management Errors and reflects a Cryptographic Vulnerability rather than a memory-safety issue.

Root Cause

The application source initializes session middleware with a literal string secret instead of loading a high-entropy value from an environment variable, secrets manager, or configuration file. Because Hospital Management System 1.0 is distributed openly, every deployment that does not modify the default inherits the same signing key. This is a classic hard-coded credential pattern that violates secret management best practices.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker who reads the public source can compute valid HMAC signatures for arbitrary session payloads. They can then craft or replay session cookies against any vulnerable instance. Exploitation complexity is rated high because the attacker must understand the session schema and target an active deployment, and the confidentiality impact is limited because the secret alone does not expose stored data.

The vulnerability mechanism is described in the GitHub CVE Discovery Document and tracked in VulDB #327932. No verified proof-of-concept code is reproduced here.

Detection Methods for CVE-2025-11609

Indicators of Compromise

• Unexpected session cookies signed with the literal string secret appearing in application logs.
• Authenticated activity from sessions that lack a corresponding successful login event.
• Source repositories containing session({ secret: 'secret' ... }) or equivalent express-session initialization.

Detection Strategies

• Perform static analysis of Node.js source for hard-coded express-session secrets, including grep patterns for secret:\s*['"]secret['"].
• Compare deployed session cookies against signatures derived from the public default key to identify vulnerable instances.
• Audit web server access logs for repeated session reuse from divergent IP addresses, which can indicate cookie forgery.

Monitoring Recommendations

• Forward web application logs and authentication events to a centralized analytics platform for correlation.
• Alert on session IDs that appear before any corresponding login or registration event.
• Track configuration drift so any reintroduction of default secrets after remediation triggers an alert.

How to Mitigate CVE-2025-11609

Immediate Actions Required

• Replace the hard-coded express-session secret with a high-entropy value sourced from an environment variable or secrets manager.
• Invalidate all existing sessions after rotating the secret to evict any forged cookies.
• Restrict external exposure of the Hospital Management System pending remediation.

Patch Information

No official vendor patch is referenced in the advisory at publication time. Operators should track updates from code-projects and the GitHub CVE Discovery Document for any forthcoming fix. Until a patched release is available, manual code modification is required.

Workarounds

• Generate a cryptographically strong secret using node -e "console.log(require('crypto').randomBytes(64).toString('hex'))" and inject it via environment variable.
• Enable cookie.httpOnly, cookie.secure, and cookie.sameSite options on the session configuration to reduce cookie abuse.
• Place the application behind a reverse proxy that enforces TLS and rate-limits session endpoints.

# Configuration example
export SESSION_SECRET="$(node -e "console.log(require('crypto').randomBytes(64).toString('hex'))")"
# In app.js, replace the hard-coded literal:
# app.use(session({ secret: process.env.SESSION_SECRET, resave: false, saveUninitialized: false, cookie: { httpOnly: true, secure: true, sameSite: 'lax' } }))