CVE-2025-7813 Overview
CVE-2025-7813 is a Server-Side Request Forgery (SSRF) vulnerability affecting the Eventin plugin for WordPress (also known as "The Events Calendar, Event Booking, Registrations and Event Tickets"). The vulnerability exists in all versions up to and including 4.0.37 via the proxy_image function. This flaw allows unauthenticated attackers to make arbitrary web requests originating from the web application, potentially enabling them to query and modify information from internal services.
Critical Impact
Unauthenticated attackers can leverage this SSRF vulnerability to access internal network resources, potentially exposing sensitive configuration data, internal APIs, and cloud metadata services from the WordPress server.
Affected Products
- Eventin WordPress Plugin versions up to and including 4.0.37
- WordPress sites using the wp-event-solution plugin
- Event Manager, Events Calendar, Tickets & Registrations – Eventin installations
Discovery Timeline
- 2025-08-23 - CVE-2025-7813 published to NVD
- 2026-04-15 - Last updated in NVD database
Technical Details for CVE-2025-7813
Vulnerability Analysis
This SSRF vulnerability resides in the proxy_image function within the Eventin plugin's hooks handler located in the core/Admin/hooks.php file. The function fails to properly validate and sanitize user-supplied URLs before making server-side HTTP requests. Because the vulnerability requires no authentication, any remote attacker can exploit this flaw without valid credentials.
The attack occurs over the network with low complexity and no user interaction required. While the vulnerability's scope is changed (affecting resources beyond its security scope), it primarily enables unauthorized read and limited write access to internal services without causing availability impact.
Root Cause
The root cause is improper input validation in the proxy_image function (CWE-918: Server-Side Request Forgery). The function accepts user-controlled URL parameters and uses them directly in outbound HTTP requests without verifying that the target URL points to an allowed external destination. This allows attackers to redirect requests to internal network addresses, localhost services, or cloud provider metadata endpoints.
Attack Vector
An unauthenticated attacker can craft malicious requests to the vulnerable proxy_image endpoint, supplying arbitrary URLs as parameters. The WordPress server then makes HTTP requests to those attacker-specified destinations, effectively acting as a proxy. This enables attackers to:
- Access internal services not exposed to the internet
- Query cloud metadata services (e.g., AWS EC2 metadata at 169.254.169.254)
- Scan internal network ports and services
- Potentially interact with internal APIs that trust requests from the WordPress server
- Exfiltrate sensitive configuration data or credentials
The vulnerable code can be reviewed in the WordPress Plugin Hooks Code. Technical details about the patched version are available in the WordPress Plugin Change Log.
Detection Methods for CVE-2025-7813
Indicators of Compromise
- Unusual outbound HTTP requests from the WordPress server to internal IP ranges (e.g., 10.x.x.x, 172.16.x.x, 192.168.x.x)
- Requests to cloud metadata endpoints (169.254.169.254) originating from the web server
- Suspicious access patterns to the proxy_image functionality with non-standard URL parameters
- Web server logs showing requests with localhost or internal service addresses as parameters
Detection Strategies
- Monitor web application firewall (WAF) logs for requests containing internal IP addresses or metadata service URLs in parameters
- Implement network monitoring to detect anomalous outbound connections from WordPress servers to internal network segments
- Review Apache/Nginx access logs for unusual patterns targeting the Eventin plugin endpoints
- Deploy intrusion detection rules to flag SSRF attack patterns in HTTP request parameters
Monitoring Recommendations
- Configure alerts for any outbound connections from web servers to RFC 1918 private address spaces
- Implement egress filtering and logging on WordPress hosting infrastructure
- Enable verbose logging for the Eventin plugin if available
- Monitor for reconnaissance activity targeting internal services from the web application tier
How to Mitigate CVE-2025-7813
Immediate Actions Required
- Update the Eventin plugin to version 4.0.38 or later immediately
- If immediate patching is not possible, disable the Eventin plugin until it can be updated
- Review server logs for signs of exploitation attempts
- Audit internal services that may have been accessed if compromise is suspected
Patch Information
The vulnerability has been addressed in Eventin plugin version 4.0.38. The fix implements proper URL validation in the proxy_image function to prevent SSRF attacks. The patch details can be reviewed in the WordPress Plugin Change Log. Additional vulnerability information is available from the Wordfence Vulnerability Report.
Workarounds
- Implement Web Application Firewall (WAF) rules to block requests containing internal IP addresses or metadata service URLs in parameters
- Configure network-level egress filtering to prevent the WordPress server from connecting to internal network ranges
- Use a reverse proxy with URL validation to inspect and block suspicious outbound requests from the plugin
- Consider temporarily disabling the image proxy functionality if the plugin provides such configuration options
# Example WAF rule to block common SSRF patterns (ModSecurity)
SecRule ARGS "@rx (127\.0\.0\.1|localhost|169\.254\.169\.254|10\.\d+\.\d+\.\d+|172\.(1[6-9]|2\d|3[01])\.\d+\.\d+|192\.168\.\d+\.\d+)" \
"id:100001,phase:2,deny,status:403,msg:'Potential SSRF attempt blocked'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
