CVE-2025-40619: Bookgy Authentication Bypass Vulnerability

CVE-2025-40619 Overview

CVE-2025-40619 is a broken access control vulnerability affecting the Bookgy booking platform. The application fails to enforce proper authorization checks across multiple areas, allowing unauthenticated attackers to access private functionality and resources reserved for other user roles. The flaw is classified under CWE-863: Incorrect Authorization. Because the vulnerability requires no authentication, no user interaction, and is exploitable over the network, it presents a direct path to confidential data and administrative functions exposed by Bookgy deployments.

Critical Impact
Unauthenticated remote attackers can reach private and role-restricted areas of Bookgy, exposing confidentiality, integrity, and availability of the application.

Affected Products

Bookgy (all versions covered by cpe:2.3:a:bookgy:bookgy:-:*:*:*:*:*:*:*)

Discovery Timeline

2025-04-29 - CVE-2025-40619 published to NVD
2025-10-14 - Last updated in NVD database

Technical Details for CVE-2025-40619

Vulnerability Analysis

The Bookgy application does not consistently verify user authorization before serving requests to protected endpoints. Multiple application areas, including those intended for privileged or role-specific use, are reachable without authentication. An attacker who knows or guesses the URL paths of restricted resources can interact with them as if they were authorized.

This is a server-side authorization failure, distinct from authentication weaknesses. The application appears to rely on indirect controls, such as obscured URLs or client-side navigation, rather than enforcing role checks at each protected resource. Attackers can therefore bypass intended access boundaries by issuing direct HTTP requests.

Root Cause

The root cause is missing or improperly implemented authorization logic on server-side endpoints [CWE-863]. The application does not validate the requester's session, role, or ownership of a resource before processing requests in multiple modules.

Attack Vector

Exploitation occurs over the network with low complexity. An unauthenticated attacker crafts HTTP requests targeting endpoints intended for administrators or other roles. Because no privilege or user interaction is required, automated scanners and scripted requests can identify and abuse the exposed endpoints.

The vulnerability is described in the INCIBE Security Notice. No public proof-of-concept code is currently available.

Detection Methods for CVE-2025-40619

Indicators of Compromise

Unauthenticated HTTP requests to administrative or role-restricted Bookgy URLs returning 200 OK rather than 401/403.
Access to records, bookings, or user data from IP addresses that have no associated authenticated session.
Anomalous enumeration patterns against Bookgy endpoints, including sequential identifier scans.

Detection Strategies

Review web server and application logs for requests to privileged paths lacking a valid session cookie or authorization header.
Deploy web application firewall rules that flag direct access attempts to administrative endpoints from unauthenticated sources.
Correlate access logs against expected role-to-endpoint mappings to surface authorization deviations.

Monitoring Recommendations

Enable verbose access logging on the Bookgy application and forward logs to a centralized SIEM for retention and analysis.
Alert on spikes in 2xx responses to endpoints historically requiring authentication.
Monitor outbound data volumes from the Bookgy host for signs of bulk data exfiltration.

How to Mitigate CVE-2025-40619

Immediate Actions Required

Restrict network exposure of the Bookgy application to trusted networks or VPN until a vendor fix is applied.
Place the application behind a reverse proxy or WAF that enforces authentication on sensitive paths.
Audit application logs for prior unauthorized access to private or role-restricted areas.

Patch Information

No vendor patch or advisory URL is currently listed in the CVE record. Administrators should monitor the INCIBE Security Notice and direct vendor communications for remediation guidance.

Workarounds

Enforce authentication and role checks at the proxy or gateway layer for all Bookgy URLs that should not be publicly accessible.
Limit application access by source IP allowlisting where feasible.
Rotate user credentials and review account roles after confirming exposure scope.

bash

# Example: nginx access restriction for sensitive Bookgy paths
location ~* ^/(admin|private|users|reports) {
    allow 10.0.0.0/8;
    deny all;
    auth_basic "Restricted";
    auth_basic_user_file /etc/nginx/.htpasswd;
    proxy_pass http://bookgy_backend;
}