CVE-2026-24964: Contest Gallery SSRF Vulnerability

CVE-2026-24964 Overview

A Server-Side Request Forgery (SSRF) vulnerability has been identified in the Contest Gallery plugin for WordPress, developed by Wasiliy Strecker / ContestGallery developer. This vulnerability allows authenticated attackers to manipulate server-side requests, potentially enabling them to access internal resources, bypass firewall restrictions, and interact with services that should not be externally accessible.

Critical Impact

Authenticated attackers can leverage this SSRF vulnerability to make arbitrary requests from the web server, potentially accessing internal network resources, metadata endpoints, and sensitive services that are not exposed to the public internet.

Affected Products

• WordPress Contest Gallery plugin (contest-gallery) versions up to and including 28.1.2.1
• WordPress installations running vulnerable versions of Contest Gallery
• Web servers hosting WordPress with the affected plugin enabled

Discovery Timeline

• 2026-03-25 - CVE CVE-2026-24964 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-24964

Vulnerability Analysis

This SSRF vulnerability (CWE-918) in the Contest Gallery WordPress plugin allows authenticated users to craft malicious requests that the server will execute on their behalf. The vulnerability requires low privileges to exploit and can affect resources beyond the vulnerable component's security scope, enabling attackers to potentially reach internal services, cloud metadata endpoints, or other restricted network resources.

The attack can be executed remotely over the network without requiring user interaction. While the vulnerability does not directly allow for full system compromise, it enables unauthorized read access to internal resources and the ability to modify certain data through forged requests.

Root Cause

The root cause of this vulnerability lies in improper validation and sanitization of user-supplied URLs or request parameters within the Contest Gallery plugin. The application fails to adequately restrict the destinations of server-side HTTP requests, allowing attackers to specify arbitrary internal or external URLs. This lack of URL validation enables the server to act as a proxy for malicious requests.

Attack Vector

The attack vector is network-based, requiring the attacker to have authenticated access to the WordPress installation with at least low-level privileges. Once authenticated, the attacker can supply malicious URLs or parameters through the Contest Gallery plugin's functionality, causing the server to make unintended HTTP requests.

Common exploitation scenarios include:

• Accessing cloud provider metadata services (e.g., http://169.254.169.254/)
• Scanning internal network ports and services
• Bypassing IP-based access controls
• Accessing internal APIs or administrative interfaces
• Exfiltrating sensitive configuration data

The vulnerability manifests in the plugin's URL handling functionality. For detailed technical information, refer to the Patchstack SSRF Vulnerability Advisory.

Detection Methods for CVE-2026-24964

Indicators of Compromise

• Unusual outbound HTTP requests from the web server to internal IP addresses (e.g., 127.0.0.1, 10.x.x.x, 172.16.x.x, 192.168.x.x)
• Web server logs showing requests to cloud metadata endpoints (e.g., 169.254.169.254)
• Unexpected network connections from the WordPress server to internal services
• Access logs showing repeated requests to Contest Gallery endpoints with suspicious URL parameters

Detection Strategies

• Monitor web application firewall (WAF) logs for SSRF patterns targeting internal addresses or metadata endpoints
• Implement network traffic analysis to detect anomalous outbound connections from web servers to internal resources
• Review WordPress activity logs for suspicious authenticated user actions involving the Contest Gallery plugin
• Deploy egress filtering rules and alert on violations from web server processes

Monitoring Recommendations

• Enable detailed logging for outbound HTTP requests from the WordPress server
• Configure alerting for any requests to RFC 1918 private address ranges from the web application
• Monitor DNS queries from the web server for unusual internal hostnames or IP-based lookups
• Implement real-time security monitoring for WordPress plugin activity and API calls

How to Mitigate CVE-2026-24964

Immediate Actions Required

• Update the Contest Gallery plugin to the latest patched version as soon as one becomes available
• Temporarily disable the Contest Gallery plugin if it is not essential to site operations
• Implement WAF rules to block SSRF attack patterns targeting the Contest Gallery plugin
• Review and restrict user accounts with access to the vulnerable plugin functionality
• Enable network egress filtering to prevent the web server from making unauthorized internal requests

Patch Information

A security patch addressing this vulnerability should be obtained from the plugin developer or WordPress plugin repository. Monitor the Patchstack SSRF Vulnerability Advisory for updated patch information and remediation guidance.

WordPress administrators should ensure automatic plugin updates are enabled or manually check for updates to Contest Gallery versions newer than 28.1.2.1.

Workarounds

• Disable or deactivate the Contest Gallery plugin until a patched version is available
• Implement network-level egress filtering to restrict outbound connections from the web server to only necessary external destinations
• Deploy a Web Application Firewall (WAF) with SSRF-specific rules to block malicious request patterns
• Restrict plugin access to only trusted administrator accounts and review user privilege levels
• Configure firewall rules to block access to cloud metadata endpoints from the web server

# Example: Block access to cloud metadata endpoint using iptables
# Run on the WordPress server to prevent SSRF to metadata services
iptables -A OUTPUT -d 169.254.169.254 -j DROP

# Block RFC 1918 internal addresses from web server outbound
iptables -A OUTPUT -d 10.0.0.0/8 -p tcp --dport 80 -j DROP
iptables -A OUTPUT -d 10.0.0.0/8 -p tcp --dport 443 -j DROP
iptables -A OUTPUT -d 172.16.0.0/12 -p tcp --dport 80 -j DROP
iptables -A OUTPUT -d 172.16.0.0/12 -p tcp --dport 443 -j DROP
iptables -A OUTPUT -d 192.168.0.0/16 -p tcp --dport 80 -j DROP
iptables -A OUTPUT -d 192.168.0.0/16 -p tcp --dport 443 -j DROP