CVE-2025-23647: WP-Clap Plugin Reflected XSS Vulnerability

CVE-2025-23647 Overview

CVE-2025-23647 is a reflected Cross-Site Scripting (XSS) vulnerability in the Ariagle WP-Clap WordPress plugin. The flaw affects all plugin versions up to and including 1.5. The vulnerability stems from improper neutralization of user-supplied input during web page generation, classified under [CWE-79]. Attackers can craft malicious URLs that, when clicked by an authenticated user or administrator, execute arbitrary JavaScript in the victim's browser session. Successful exploitation can lead to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim within the WordPress site.

Critical Impact
Reflected XSS enables attackers to execute arbitrary script in a victim's browser, potentially compromising WordPress administrator sessions and enabling site takeover through privileged account abuse.

Affected Products

Ariagle WP-Clap WordPress plugin versions through 1.5
WordPress sites with wp-clap installed and active
All hosting environments running the vulnerable plugin

Discovery Timeline

2025-02-14 - CVE-2025-23647 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-23647

Vulnerability Analysis

The WP-Clap plugin fails to sanitize and escape user-controllable input before reflecting it back into the HTTP response. An attacker constructs a URL containing JavaScript payloads in a vulnerable parameter handled by the plugin. When a user visits the crafted URL, the server reflects the unsanitized payload into the rendered HTML, and the browser executes it in the context of the WordPress origin.

This is a classic reflected XSS pattern requiring user interaction. The scope is changed because script executed in the WordPress origin can access cookies, the DOM, and authenticated REST API endpoints accessible to the victim. If the victim is an administrator, the attacker can create new admin accounts, install plugins, or modify content through admin-ajax.php and the WordPress REST API.

Root Cause

The plugin code directly outputs request parameters into HTML responses without applying WordPress sanitization functions such as esc_html(), esc_attr(), or wp_kses(). This violates WordPress secure coding guidelines for output escaping.

Attack Vector

Exploitation requires a network-reachable WordPress instance with WP-Clap installed and a victim willing to click an attacker-supplied link. The attacker delivers the malicious URL through phishing email, social media, forum posts, or compromised third-party sites. No authentication is required to craft the payload, but the victim must follow the link for the script to execute.

The vulnerability mechanism is described in the Patchstack WP-Clap advisory. No verified public proof-of-concept code is currently available.

Detection Methods for CVE-2025-23647

Indicators of Compromise

Inbound HTTP requests to WP-Clap plugin endpoints containing URL-encoded <script>, onerror=, onload=, or javascript: strings in query parameters
Web server access logs showing unusual referrers leading to wp-clap resources with long or encoded query strings
Unexpected creation of WordPress administrator accounts or plugin installations following suspicious user clicks

Detection Strategies

Deploy Web Application Firewall (WAF) rules that flag reflected XSS patterns in requests targeting /wp-content/plugins/wp-clap/ paths
Inspect WordPress access logs for query parameters containing HTML tags, event handlers, or encoded script payloads
Correlate browser-side Content Security Policy (CSP) violation reports with server access logs to identify exploitation attempts

Monitoring Recommendations

Audit installed WordPress plugins and flag any wp-clap version at or below 1.5
Monitor administrator session activity for anomalous REST API calls following external link clicks
Alert on new privileged user creation, plugin installation, or theme modification events outside change windows

How to Mitigate CVE-2025-23647

Immediate Actions Required

Disable or uninstall the WP-Clap plugin until a vendor-supplied patch is verified
Force password resets and invalidate active sessions for all WordPress administrators
Restrict administrative access to known IP addresses through web server or WAF policy

Patch Information

No fixed version is referenced in the available advisory data. The vulnerability affects WP-Clap through version 1.5. Site operators should consult the Patchstack advisory for updated remediation guidance and monitor the WordPress plugin repository for a patched release.

Workarounds

Remove the WP-Clap plugin from the WordPress installation if a patched version is unavailable
Deploy a WAF with managed rules covering OWASP Top 10 XSS signatures and virtual patching for WordPress
Implement a strict Content Security Policy that disallows inline scripts and restricts script sources
Train administrators to avoid clicking unsolicited links targeting the WordPress admin domain

bash

# Example: disable the plugin via WP-CLI
wp plugin deactivate wp-clap
wp plugin delete wp-clap

# Example: nginx rule to block obvious XSS payloads targeting the plugin
# location ~* /wp-content/plugins/wp-clap/ {
#     if ($args ~* "(<|%3C)script") { return 403; }
# }