CVE-2026-1202: CRMEB Authentication Bypass Vulnerability

CVE-2026-1202 Overview

A critical authentication bypass vulnerability has been discovered in CRMEB, an open-source e-commerce system. The vulnerability exists in the appleLogin function within the file crmeb/app/api/controller/v1/LoginController.php. By manipulating the openId argument, attackers can bypass proper authentication mechanisms, potentially gaining unauthorized access to user accounts and sensitive data.

Critical Impact

This improper authentication vulnerability allows remote attackers to bypass Apple Login authentication controls, potentially compromising user accounts without valid credentials.

Affected Products

• CRMEB versions up to and including 5.6.3
• Applications using the vulnerable appleLogin function in LoginController.php
• E-commerce deployments utilizing CRMEB's Apple Sign-In integration

Discovery Timeline

• 2026-01-20 - CVE-2026-1202 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2026-1202

Vulnerability Analysis

This vulnerability is classified under CWE-287 (Improper Authentication), which occurs when an application fails to properly verify user identity before granting access to restricted functionality. In this case, the appleLogin function in CRMEB's LoginController does not adequately validate the openId parameter submitted during the Apple Sign-In authentication flow.

The flaw allows remote attackers to craft malicious requests that manipulate the openId argument, effectively bypassing the authentication check that should verify the user's identity through Apple's authentication service. This represents a significant security risk as it undermines the entire authentication mechanism intended to protect user accounts.

Root Cause

The root cause lies in insufficient validation of the openId parameter within the appleLogin function. The application appears to trust user-supplied openId values without properly verifying them against Apple's authentication servers. This design flaw means that an attacker can supply arbitrary or manipulated openId values to authenticate as other users without possessing their valid Apple credentials.

Proper implementation should cryptographically verify the identity token received from Apple and validate the openId against the authenticated session rather than accepting client-supplied values directly.

Attack Vector

The attack is network-based and can be executed remotely without requiring any prior authentication or user interaction. An attacker would craft a malicious HTTP request to the Apple login endpoint, manipulating the openId parameter to impersonate a target user.

The exploitation process typically involves:

1. Identifying a valid target user's openId or using enumeration techniques
2. Sending a crafted authentication request with the manipulated openId value
3. Bypassing authentication to gain unauthorized access to the target account

Note: A public proof-of-concept for this vulnerability has been disclosed. Technical details and exploitation methodology can be found in the GitHub PoC Repository.

Detection Methods for CVE-2026-1202

Indicators of Compromise

• Unusual authentication patterns involving the Apple login endpoint without corresponding Apple OAuth callbacks
• Multiple successful logins from different geographic locations for the same user account in short time periods
• Authentication requests to /api/v1/login endpoints with suspicious or malformed openId parameters
• Log entries showing successful Apple authentication without proper token verification

Detection Strategies

• Monitor authentication logs for requests to the appleLogin endpoint that lack proper Apple OAuth token validation
• Implement rate limiting and anomaly detection on authentication endpoints to identify brute-force or enumeration attempts
• Deploy web application firewall (WAF) rules to inspect and validate openId parameters in Apple login requests
• Enable detailed logging for all authentication events to facilitate forensic analysis

Monitoring Recommendations

• Set up alerts for authentication success events that occur without corresponding Apple OAuth token verification
• Monitor for unusual patterns in user session creation, particularly accounts being accessed from multiple IP addresses simultaneously
• Implement real-time monitoring of the LoginController.php endpoint for suspicious request patterns
• Review access logs regularly for signs of account takeover or unauthorized access attempts

How to Mitigate CVE-2026-1202

Immediate Actions Required

• Disable the Apple Login functionality in CRMEB until a patch is available if this feature is not business-critical
• Implement additional server-side validation to verify openId values against Apple's authentication servers
• Review authentication logs for signs of exploitation and reset credentials for any potentially compromised accounts
• Apply network-level restrictions to limit access to the authentication endpoint from trusted IP ranges where possible

Patch Information

As of the last update, the vendor (CRMEB) was contacted about this disclosure but did not respond. No official patch is currently available. Organizations using affected versions should implement the workarounds below and monitor vendor channels for security updates.

For the latest information, refer to:

• VulDB Entry #341788
• VulDB CTI #341788

Workarounds

• Disable the Apple Sign-In integration by removing or commenting out the appleLogin route in your application configuration
• Implement a middleware layer that validates Apple identity tokens directly with Apple's servers before processing authentication
• Add additional verification steps such as email confirmation or two-factor authentication for Apple Sign-In users
• Consider implementing IP-based restrictions or CAPTCHA challenges on the authentication endpoint to slow down automated attacks

# Example: Disable Apple Login route in CRMEB (modify route configuration)
# Location: crmeb/app/api/route/v1/login.php
# Comment out or remove the appleLogin route definition

# Add rate limiting to authentication endpoints using nginx
# /etc/nginx/conf.d/rate_limiting.conf
limit_req_zone $binary_remote_addr zone=login_limit:10m rate=5r/m;

location ~ /api/v1/.*login {
    limit_req zone=login_limit burst=3 nodelay;
    # ... existing configuration
}