CVE-2026-25385: URL Shortify SSRF Vulnerability

CVE-2026-25385 Overview

A Server-Side Request Forgery (SSRF) vulnerability has been identified in the KaizenCoders URL Shortify WordPress plugin. This vulnerability allows an authenticated attacker with high privileges to craft malicious requests that the server will execute, potentially enabling access to internal network resources, sensitive data exfiltration, or pivoting to other internal systems.

Critical Impact

Authenticated attackers with administrative privileges can abuse the SSRF vulnerability to make the WordPress server send requests to internal or external resources, potentially bypassing firewalls and accessing internal services that should not be publicly accessible.

Affected Products

• KaizenCoders URL Shortify WordPress Plugin versions up to and including 1.12.3
• WordPress installations running vulnerable URL Shortify plugin versions

Discovery Timeline

• 2026-02-19 - CVE CVE-2026-25385 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-25385

Vulnerability Analysis

This SSRF vulnerability (CWE-918) exists in the URL Shortify plugin's URL handling functionality. The plugin fails to properly validate and sanitize user-supplied URLs before making server-side requests. When a privileged user provides a URL for shortening or preview functionality, the server processes this URL without adequate checks, allowing the attacker to specify arbitrary destinations including internal network addresses.

The vulnerability requires network access and high-level privileges (administrator role) to exploit, but once exploited, it can affect resources beyond the vulnerable component's security scope. This cross-scope impact means the attacker can potentially reach internal services, cloud metadata endpoints, or other protected resources that the WordPress server has access to.

Root Cause

The root cause stems from insufficient input validation in the URL Shortify plugin's request handling mechanism. The plugin does not implement proper URL scheme whitelisting, hostname validation, or IP address restrictions when processing URLs submitted for shortening. This allows attackers to supply URLs pointing to internal network resources such as http://127.0.0.1, http://localhost, internal IP ranges like http://192.168.x.x, or cloud metadata endpoints like http://169.254.169.254.

Attack Vector

The attack is conducted over the network by an authenticated user with administrator-level privileges. The attacker submits a specially crafted URL through the plugin's URL shortening interface. Since the server-side code does not validate the target URL's destination, it makes requests to the attacker-specified location. This can be leveraged to:

• Scan internal network ports and services
• Access cloud provider metadata services to retrieve credentials
• Read internal configuration files through file:// protocol handlers
• Interact with internal APIs and databases
• Bypass network-level access controls

The vulnerability exploits the trust relationship between the WordPress server and internal network resources, effectively turning the web server into a proxy for the attacker.

Detection Methods for CVE-2026-25385

Indicators of Compromise

• Unusual outbound requests from the WordPress server to internal IP addresses (127.0.0.1, 10.x.x.x, 172.16.x.x-172.31.x.x, 192.168.x.x)
• Requests to cloud metadata endpoints (169.254.169.254) from the WordPress application
• HTTP access logs showing URL Shortify plugin endpoints with unusual URL parameters
• Server logs indicating connections to non-standard ports or internal services
• Unexpected DNS lookups for internal hostnames from the web server

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SSRF patterns in URL parameters
• Monitor WordPress admin activity logs for suspicious URL shortening requests
• Configure network monitoring to alert on unusual internal network traffic originating from web servers
• Deploy application-level logging to capture all URLs processed by the URL Shortify plugin
• Use SentinelOne's Singularity platform to detect anomalous network behavior and lateral movement attempts

Monitoring Recommendations

• Enable verbose logging for the URL Shortify plugin and review logs regularly
• Set up alerts for requests to private IP ranges and localhost from the WordPress server
• Monitor outbound connection patterns from web application servers
• Implement DNS logging to detect queries for internal resources from public-facing servers

How to Mitigate CVE-2026-25385

Immediate Actions Required

• Update the URL Shortify plugin to a patched version when available from KaizenCoders
• Temporarily disable the URL Shortify plugin if not critical to operations
• Restrict plugin administrative functionality to trusted users only
• Implement network-level controls to prevent the WordPress server from accessing sensitive internal resources

Patch Information

Organizations should monitor the Patchstack SSRF Vulnerability Advisory for patch availability and update instructions. Once a patched version is released by KaizenCoders, administrators should upgrade to a version newer than 1.12.3 immediately.

Workarounds

• Implement server-side egress filtering to block requests to internal IP ranges and metadata endpoints
• Use a reverse proxy or WAF to filter malicious URL patterns before they reach the WordPress application
• Configure PHP's allow_url_fopen and allow_url_include directives appropriately to limit server-side URL handling
• Apply the principle of least privilege by restricting administrative access to the URL Shortify plugin

# Example: Configure web server to restrict outbound connections (iptables)
# Block outbound connections to internal networks from web server user
iptables -A OUTPUT -m owner --uid-owner www-data -d 127.0.0.0/8 -j DROP
iptables -A OUTPUT -m owner --uid-owner www-data -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -m owner --uid-owner www-data -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -m owner --uid-owner www-data -d 192.168.0.0/16 -j DROP
iptables -A OUTPUT -m owner --uid-owner www-data -d 169.254.169.254 -j DROP