CVE-2025-23571 Overview
CVE-2025-23571 is a reflected Cross-Site Scripting (XSS) vulnerability in the Internal Links Generator WordPress plugin developed by makong. The flaw stems from improper neutralization of user-supplied input during web page generation, classified under [CWE-79]. All plugin versions up to and including 3.51 are affected. An attacker can craft a malicious URL that, when clicked by a victim, executes arbitrary JavaScript in the victim's browser session under the context of the vulnerable WordPress site.
Critical Impact
Successful exploitation allows attackers to execute arbitrary scripts in a victim's browser, enabling session theft, credential harvesting, and unauthorized actions performed on behalf of authenticated users including administrators.
Affected Products
- makong Internal Links Generator plugin for WordPress
- All versions from initial release through 3.51
- WordPress installations with the internal-links-generator plugin enabled
Discovery Timeline
- 2025-02-14 - CVE-2025-23571 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-23571
Vulnerability Analysis
The vulnerability is a reflected XSS issue in the Internal Links Generator WordPress plugin. The plugin echoes user-controlled input back into HTTP responses without applying adequate output encoding or input sanitization. When a victim visits a crafted URL containing malicious JavaScript payloads in request parameters, the plugin reflects that payload directly into the rendered HTML.
The attack requires user interaction, meaning the victim must click an attacker-supplied link or visit an attacker-controlled page. Because the issue causes a scope change (S:C in the CVSS vector), the executed script can affect resources beyond the vulnerable component's security context. This includes the WordPress administrative interface if an admin user is tricked into following the link.
Root Cause
The root cause is the failure to apply proper output encoding via WordPress sanitization functions such as esc_html(), esc_attr(), or wp_kses() before rendering user-supplied parameters. Input received via GET or POST parameters is concatenated directly into HTML output, allowing tags such as <script> and event handlers to execute when rendered by the browser.
Attack Vector
The attack is network-based and requires no authentication. The attacker delivers a crafted URL through phishing emails, social media, malicious advertising, or compromised third-party sites. When a logged-in WordPress user (particularly an administrator) clicks the link, the embedded JavaScript executes within the trusted origin of the WordPress site. Common payloads include cookie exfiltration, forced administrative actions via the REST API, and injection of persistent backdoors through plugin or theme editor functionality.
For verified technical details and proof-of-concept information, see the Patchstack Vulnerability Advisory.
Detection Methods for CVE-2025-23571
Indicators of Compromise
- HTTP request logs containing URL parameters with encoded <script>, onerror=, onload=, or javascript: patterns directed at endpoints handled by the internal-links-generator plugin
- Unexpected outbound requests from administrator browser sessions to external domains immediately after WordPress navigation events
- New unauthorized administrative users, modified plugin files, or unexpected REST API calls following an admin user clicking an external link
Detection Strategies
- Inspect web server access logs for requests targeting plugin endpoints with suspicious query string content containing HTML or JavaScript syntax
- Deploy a Web Application Firewall (WAF) rule set that flags reflected XSS payload signatures against WordPress plugin URIs
- Correlate browser referrer headers from administrative sessions with known phishing infrastructure or recently registered domains
Monitoring Recommendations
- Enable WordPress audit logging to capture plugin and user account modifications in near real-time
- Monitor for changes to wp_users, wp_usermeta, and option tables that may indicate post-exploitation persistence
- Alert on unusual admin-ajax.php and REST API request volumes originating from authenticated admin sessions
How to Mitigate CVE-2025-23571
Immediate Actions Required
- Identify all WordPress installations running the Internal Links Generator plugin at version 3.51 or earlier
- Deactivate and remove the plugin until a patched version is verified available from the vendor
- Force a password reset for all administrative accounts and invalidate active sessions if compromise is suspected
Patch Information
At the time of publication, the Patchstack Vulnerability Advisory lists the affected range as n/a through <= 3.51. Administrators should consult the official WordPress plugin repository for the latest version and apply any vendor-released fix immediately. If no patch is available, removal is the recommended action.
Workarounds
- Deploy WAF rules that block requests containing reflected XSS payload signatures targeting the internal-links-generator plugin URI paths
- Restrict access to the WordPress administration panel by IP allowlisting to limit exposure of high-privilege accounts to phishing-delivered links
- Train administrators to avoid clicking unsolicited links while authenticated to WordPress and to use a separate browser profile for administrative tasks
# Configuration example: disable the vulnerable plugin via WP-CLI
wp plugin deactivate internal-links-generator
wp plugin delete internal-links-generator
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
