CVE-2025-23506: WP IMAP Auth Reflected XSS Vulnerability

CVE-2025-23506 Overview

CVE-2025-23506 is a reflected cross-site scripting (XSS) vulnerability in the WP IMAP Auth plugin (wp-imap-authentication) for WordPress, developed by imsoftware. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. All plugin versions up to and including 4.0.1 are affected. Attackers can craft malicious URLs that, when clicked by an authenticated or unauthenticated victim, execute arbitrary JavaScript in the victim's browser within the context of the vulnerable WordPress site. The issue carries a CVSS 3.1 score of 7.1 with a scope change, reflecting impact beyond the vulnerable component.

Critical Impact

Successful exploitation allows attackers to execute arbitrary JavaScript in victim browsers, enabling session theft, credential harvesting, and unauthorized actions against the WordPress site.

Affected Products

• imsoftware WP IMAP Auth plugin for WordPress
• Versions from n/a through <= 4.0.1
• WordPress sites with the wp-imap-authentication plugin installed

Discovery Timeline

• 2025-01-22 - CVE-2025-23506 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-23506

Vulnerability Analysis

The vulnerability is a reflected XSS issue in the WP IMAP Auth WordPress plugin. The plugin fails to properly sanitize or encode user-controlled input before reflecting it back into generated HTML responses. As a result, attacker-supplied script content embedded in request parameters is rendered directly in the browser as executable JavaScript.

Because the CVSS vector indicates a scope change (S:C) with user interaction required (UI:R), the attack requires a victim to click a crafted link or submit a malicious form. Once triggered, the injected script runs in the security context of the WordPress site, affecting components beyond the plugin itself. The EPSS score of 0.299% places exploitation probability in the moderate-low range, but the public availability of WordPress plugin attack tooling lowers practical exploitation barriers.

Root Cause

The root cause is missing or insufficient output encoding when the plugin echoes request parameters into HTML responses. Input that should be HTML-escaped using functions such as esc_html(), esc_attr(), or wp_kses() is instead rendered verbatim, allowing <script> tags and event handler attributes to break out of the intended HTML context.

Attack Vector

The attack is network-based and requires user interaction. An attacker crafts a URL targeting a vulnerable plugin endpoint with malicious JavaScript embedded in a query parameter. The attacker delivers this URL through phishing emails, malicious advertisements, or compromised third-party sites. When a victim visits the link, the plugin reflects the payload into the response, and the browser executes the script under the WordPress site's origin. The injected code can steal authentication cookies, perform actions as the authenticated user, deface pages, or pivot to administrative functions if an administrator is the victim.

For detailed technical analysis of the affected request parameters and exploitation paths, refer to the Patchstack WordPress Plugin Vulnerability advisory.

Detection Methods for CVE-2025-23506

Indicators of Compromise

• HTTP requests to wp-imap-authentication plugin endpoints containing URL-encoded <script>, onerror=, onload=, or javascript: payloads in query parameters
• Unexpected outbound requests from user browsers to attacker-controlled domains following clicks on WordPress-hosted links
• WordPress access logs showing unusually long or obfuscated query strings targeting plugin paths
• Reports from end users describing unexpected redirects, popups, or session anomalies after visiting site URLs

Detection Strategies

• Inspect web server access logs for requests to plugin URIs containing characters like <, >, ", or encoded equivalents (%3C, %3E)
• Deploy web application firewall (WAF) rules that flag reflected payloads matching common XSS signatures
• Use Content Security Policy (CSP) violation reporting to capture script execution attempts from non-allowlisted sources

Monitoring Recommendations

• Monitor WordPress plugin inventory for installations of wp-imap-authentication at version 4.0.1 or earlier
• Enable verbose logging on the WordPress site and forward access logs to a centralized SIEM for correlation
• Track abnormal session activity, including new administrative actions originating from unusual IP addresses or user agents

How to Mitigate CVE-2025-23506

Immediate Actions Required

• Identify all WordPress installations running the WP IMAP Auth plugin and confirm the installed version
• Disable or uninstall the plugin if a patched version is not available or not required for site functionality
• Rotate WordPress administrator credentials and invalidate active sessions if exploitation is suspected
• Deploy WAF rules to filter reflected XSS payloads targeting the plugin endpoints

Patch Information

At the time of publication, the advisory lists affected versions through <= 4.0.1. Administrators should monitor the Patchstack advisory and the WordPress plugin repository for an updated release that addresses the input sanitization flaw, and apply the patch immediately when available.

Workarounds

• Remove the wp-imap-authentication plugin until a fixed version is published by the vendor
• Implement a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
• Enable a virtual patching solution such as Patchstack or a WAF with reflected XSS protections to block malicious payloads at the edge

# Example: Disable the vulnerable plugin via WP-CLI
wp plugin deactivate wp-imap-authentication
wp plugin uninstall wp-imap-authentication

# Example: Apache mod_security rule to block common XSS payloads on plugin paths
SecRule REQUEST_URI "@contains /wp-content/plugins/wp-imap-authentication/" \
  "chain,deny,status:403,id:1002350,msg:'Block XSS attempt on WP IMAP Auth'"
  SecRule ARGS "@rx (?i)(<script|onerror=|onload=|javascript:)"