CVE-2025-5511: Shiyi-blog Auth Bypass Vulnerability

CVE-2025-5511 Overview

A critical improper authorization vulnerability has been identified in quequnlong shiyi-blog up to version 1.2.1. This security flaw affects the /dev api/app/album/photos/ endpoint, allowing attackers to bypass password verification and directly access protected photo albums. The vulnerability can be exploited remotely without authentication, enabling unauthorized access to sensitive user content.

Critical Impact

Attackers can bypass authentication controls to access password-protected photo albums, potentially exposing private user content without proper authorization.

Affected Products

• quequnlong shiyi-blog versions up to 1.2.1

Discovery Timeline

• June 3, 2025 - CVE-2025-5511 published to NVD
• October 3, 2025 - Last updated in NVD database

Technical Details for CVE-2025-5511

Vulnerability Analysis

This vulnerability stems from improper authorization handling (CWE-266: Incorrect Privilege Assignment) in the shiyi-blog application's photo album functionality. The affected endpoint /dev api/app/album/photos/ fails to properly validate user permissions before granting access to protected resources. This authorization bypass allows unauthenticated attackers to view photo albums that should require password verification.

The vulnerability is exploitable over the network without requiring any user interaction or prior authentication. The attack complexity is low, making it accessible to attackers with minimal technical sophistication.

Root Cause

The root cause of this vulnerability is incorrect privilege assignment in the photo album access control mechanism. The application does not properly enforce password verification checks on the affected API endpoint, allowing direct access to protected album content. This represents a fundamental failure in the authorization logic where the security boundary between public and private content is not properly enforced.

Attack Vector

The attack is initiated remotely through the network by sending specially crafted requests to the vulnerable API endpoint. An attacker can bypass password verification mechanisms and directly access protected photo albums by manipulating requests to the /dev api/app/album/photos/ endpoint. The public disclosure of this vulnerability on GitHub provides detailed information about the bypass technique.

The vulnerability allows attackers to:

• Access password-protected photo albums without authentication
• View private user content that should be restricted
• Enumerate and retrieve protected resources across the application

Detection Methods for CVE-2025-5511

Indicators of Compromise

• Unusual access patterns to the /dev api/app/album/photos/ endpoint from unauthenticated sessions
• HTTP requests to album endpoints that bypass normal authentication flows
• Access logs showing direct requests to protected album resources without corresponding authentication events
• Abnormal volume of API requests to photo album endpoints from single IP addresses

Detection Strategies

• Monitor web application logs for direct access attempts to the /dev api/app/album/photos/ endpoint without proper session tokens
• Implement anomaly detection for API requests that access protected resources without corresponding authentication events
• Review access control logs for unauthorized access patterns to photo album functionality
• Deploy web application firewall (WAF) rules to detect and block suspicious requests to the affected endpoint

Monitoring Recommendations

• Enable detailed logging for all requests to the photo album API endpoints
• Set up alerts for access patterns indicative of authorization bypass attempts
• Monitor for bulk access to album resources that may indicate automated exploitation
• Implement rate limiting on the affected endpoint to slow down potential exploitation attempts

How to Mitigate CVE-2025-5511

Immediate Actions Required

• If running shiyi-blog version 1.2.1 or earlier, consider taking the application offline or restricting access until a patch is available
• Implement additional access controls at the network or web server level to protect the vulnerable endpoint
• Review access logs for signs of prior exploitation and unauthorized access to protected albums
• Consider implementing a reverse proxy or WAF rule to enforce authentication on the affected endpoint

Patch Information

No official patch information is currently available from the vendor. According to the vulnerability disclosure, the vendor was contacted early about this issue but did not respond. Users should monitor the GitHub Security Blog and VulDB #310925 for updates on remediation options.

Workarounds

• Implement network-level access restrictions to limit who can reach the vulnerable endpoint
• Deploy a web application firewall (WAF) with custom rules to enforce authentication on the /dev api/app/album/photos/ path
• Consider disabling the photo album feature entirely until a proper fix is available
• Implement additional server-side authentication checks before the affected endpoint

# Example nginx configuration to restrict access to vulnerable endpoint
location /dev\ api/app/album/photos/ {
    # Require authentication at the web server level
    auth_basic "Restricted Access";
    auth_basic_user_file /etc/nginx/.htpasswd;
    
    # Alternatively, restrict to specific IP addresses
    # allow 192.168.1.0/24;
    # deny all;
}