CVE-2025-23739 Overview
CVE-2025-23739 is a reflected cross-site scripting (XSS) vulnerability in the WP Ultimate Reviews FREE WordPress plugin by jtibbles. The flaw affects all plugin versions up to and including 1.0.2. It stems from improper neutralization of user-supplied input during web page generation [CWE-79]. An unauthenticated attacker can craft a malicious URL that, when clicked by a victim, executes arbitrary JavaScript in the victim's browser session. The vulnerability requires user interaction and operates over the network, with scope change allowing impact beyond the vulnerable component.
Critical Impact
Attackers can execute arbitrary JavaScript in a victim's browser, enabling session hijacking, credential theft, or redirection to attacker-controlled infrastructure.
Affected Products
- WP Ultimate Reviews FREE plugin for WordPress
- All versions from initial release through 1.0.2
- WordPress sites running the wp-ultimate-reviews-free plugin
Discovery Timeline
- 2025-03-03 - CVE-2025-23739 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-23739
Vulnerability Analysis
The vulnerability is a reflected cross-site scripting flaw classified under [CWE-79]. The WP Ultimate Reviews FREE plugin fails to properly sanitize or encode user-supplied input before reflecting it back into HTTP responses. When a victim visits a specially crafted URL, the malicious payload renders as executable JavaScript in the browser context of the targeted WordPress site.
Reflected XSS in a WordPress plugin can be weaponized against authenticated administrators. Successful exploitation allows attackers to steal session cookies, perform actions on behalf of the victim, inject malicious content, or pivot to administrative account takeover. The scope-changed nature of this vulnerability indicates impact extends beyond the vulnerable plugin to the broader WordPress installation.
Root Cause
The root cause is missing or insufficient output encoding of user-controlled input within the plugin's request handling logic. Input received via HTTP request parameters is incorporated directly into the rendered page without applying WordPress functions such as esc_html(), esc_attr(), or wp_kses(). This permits attacker-supplied HTML and JavaScript to be interpreted by the browser.
Attack Vector
Exploitation requires an attacker to deliver a crafted URL to a victim through phishing, social engineering, or malicious links on third-party sites. When the victim clicks the link, the WordPress site reflects the malicious payload, executing it in the victim's browser. No authentication is required on the attacker's side, but user interaction is mandatory. The attack proceeds over the network with low complexity.
The vulnerability mechanism is described in the Patchstack WordPress Vulnerability Advisory. No public proof-of-concept exploit code has been confirmed.
Detection Methods for CVE-2025-23739
Indicators of Compromise
- HTTP request logs containing URL parameters with encoded <script> tags, javascript: URIs, or event handler attributes such as onerror= and onload=
- Unexpected outbound requests from administrator browsers to unfamiliar domains following access to plugin-related URLs
- WordPress audit logs showing administrative actions originating from unusual session contexts or IP addresses
Detection Strategies
- Inspect web server access logs for requests targeting wp-ultimate-reviews-free endpoints containing suspicious query string payloads
- Deploy a Web Application Firewall (WAF) with rules to identify reflected XSS payload patterns in inbound HTTP requests
- Monitor browser-side Content Security Policy (CSP) violation reports for blocked inline script execution attempts
Monitoring Recommendations
- Centralize WordPress and web server logs for correlation against known XSS payload signatures
- Track plugin version inventory across WordPress estates to identify hosts running wp-ultimate-reviews-free version 1.0.2 or earlier
- Alert on referrer headers from external domains pointing to plugin endpoints, which may indicate phishing-driven exploitation
How to Mitigate CVE-2025-23739
Immediate Actions Required
- Identify all WordPress installations with the WP Ultimate Reviews FREE plugin installed and record affected version numbers
- Deactivate and remove the plugin if a patched version is not available or the plugin is not actively used
- Force a password reset for WordPress administrator accounts that may have interacted with crafted links
- Apply WAF rules to block reflected XSS payloads targeting plugin parameters until remediation is complete
Patch Information
At the time of publication, the advisory indicates the vulnerability affects WP Ultimate Reviews FREE versions through 1.0.2. Review the Patchstack WordPress Vulnerability Advisory for the latest patch status and update the plugin to the fixed release once available.
Workarounds
- Deactivate the WP Ultimate Reviews FREE plugin until a vendor patch is released
- Implement a strict Content Security Policy (CSP) restricting inline script execution and external script sources
- Configure WAF signatures to reject HTTP requests containing common XSS payload patterns aimed at plugin parameters
- Restrict administrative access to WordPress through IP allowlisting and require multi-factor authentication for all privileged accounts
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
