CVE-2025-15586: OGP-Website Auth Bypass Vulnerability

CVE-2025-15586 Overview

CVE-2025-15586 is a critical authentication bypass vulnerability affecting OGP-Website (Open Game Panel Website) installations prior to git commit 52f865a4fba763594453068acf8fa9e3fc38d663. The vulnerability stems from a type juggling flaw in PHP that allows attackers to bypass authentication mechanisms without knowing the victim account's password.

Type juggling vulnerabilities occur when PHP's loose comparison operators (==) improperly compare values of different types, leading to unexpected boolean evaluations. In this case, the flaw enables complete authentication bypass, granting unauthorized access to user accounts including administrative accounts.

Critical Impact

Attackers can bypass authentication and gain unauthorized access to any user account, including administrator accounts, without requiring valid credentials. This can lead to complete system compromise.

Affected Products

• OGP-Website installations prior to commit 52f865a4fba763594453068acf8fa9e3fc38d663
• Open Game Panel web interface deployments using vulnerable authentication logic

Discovery Timeline

• 2026-02-19 - CVE-2025-15586 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2025-15586

Vulnerability Analysis

This vulnerability is classified under CWE-287 (Improper Authentication), representing a fundamental flaw in how the OGP-Website validates user credentials during the authentication process.

The type juggling vulnerability exists because PHP's loose comparison operator treats certain string and integer comparisons in unexpected ways. When password hashes or authentication tokens are compared using == instead of the strict === operator, specially crafted input can cause the comparison to evaluate as true even when the values don't match.

This is particularly dangerous because it requires no prior knowledge of the target account's password. An attacker can craft malicious authentication requests that exploit the type juggling behavior to authenticate as any user, including administrators, effectively bypassing all authentication controls.

Root Cause

The root cause is the use of PHP's loose comparison operator (==) in authentication-related code paths instead of the strict comparison operator (===). In PHP, loose comparisons can lead to type coercion where strings beginning with numeric values may be compared as integers, and magic hash values (strings that when hashed produce results starting with 0e) are treated as zero in numeric context.

For example, if a password hash begins with 0e followed by only digits, PHP's loose comparison treats it as scientific notation equal to zero. An attacker who can trigger this condition can authenticate by providing any input that also evaluates to zero when loosely compared.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability remotely by:

1. Identifying the OGP-Website login endpoint
2. Crafting authentication requests with specially formatted input values designed to exploit PHP type juggling
3. Submitting requests that cause loose comparisons to evaluate as true
4. Gaining unauthorized access to target accounts without valid credentials

The vulnerability is accessible via standard HTTP requests to the authentication endpoint, making it trivially exploitable once the attack methodology is understood. Technical details of the exploitation methodology can be found in the Project Black Blog Analysis.

Detection Methods for CVE-2025-15586

Indicators of Compromise

• Unexpected administrative logins or session creations from unfamiliar IP addresses
• Authentication logs showing successful logins without corresponding valid credential submissions
• Anomalous user activity patterns, particularly for privileged accounts
• Server access logs containing unusual authentication request patterns with malformed or suspicious parameter values

Detection Strategies

• Monitor authentication logs for successful logins that lack proper credential validation patterns
• Implement Web Application Firewall (WAF) rules to detect and block requests with type juggling attack patterns
• Review access logs for authentication attempts containing numeric-only strings or 0e-prefixed values in credential fields
• Deploy intrusion detection signatures specifically targeting PHP type juggling exploitation attempts

Monitoring Recommendations

• Enable verbose authentication logging to capture all login attempts and their parameters
• Configure alerts for multiple successful authentications from different user accounts originating from the same IP address in short time periods
• Monitor for unauthorized changes to user accounts, permissions, or system configurations
• Implement session monitoring to detect abnormal account access patterns

How to Mitigate CVE-2025-15586

Immediate Actions Required

• Update OGP-Website to commit 52f865a4fba763594453068acf8fa9e3fc38d663 or later immediately
• Review authentication logs for signs of unauthorized access
• Reset passwords for all user accounts, especially administrative accounts
• Audit system configurations and user permissions for unauthorized changes

Patch Information

The vulnerability has been addressed in commit 52f865a4fba763594453068acf8fa9e3fc38d663. This fix corrects the authentication logic by implementing strict comparison operators and proper type validation. The associated pull request #644 contains additional context and discussion about the fix.

Organizations should update their OGP-Website installations by pulling the latest commits from the official repository:

cd /path/to/OGP-Website
git fetch origin
git checkout 52f865a4fba763594453068acf8fa9e3fc38d663

Workarounds

• If immediate patching is not possible, consider temporarily disabling external access to the OGP-Website authentication endpoint
• Implement network-level access controls to restrict authentication endpoints to trusted IP ranges only
• Deploy a Web Application Firewall with rules to filter potentially malicious authentication requests
• Monitor all authentication activity closely until the patch can be applied

# Example: Restrict access to OGP-Website via iptables (temporary workaround)
# Allow only trusted IP ranges to access the web panel
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP