CVE-2025-26751: Alphabetic Pagination XSS Vulnerability

CVE-2025-26751 Overview

CVE-2025-26751 is a reflected Cross-Site Scripting (XSS) vulnerability in the Fahad Mahmood Alphabetic Pagination plugin for WordPress. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. All plugin versions up to and including 3.2.1 are affected.

Attackers can craft malicious URLs that, when clicked by an authenticated user, execute arbitrary JavaScript in the victim's browser. The scope is changed (S:C), meaning injected script can affect resources beyond the vulnerable component, including the WordPress admin context.

Critical Impact
Successful exploitation enables session hijacking, credential theft, and unauthorized actions in the context of an authenticated WordPress user, including administrators.

Affected Products

Fahad Mahmood Alphabetic Pagination plugin for WordPress
Versions from n/a through <= 3.2.1
WordPress sites with the plugin installed and active

Discovery Timeline

2025-02-25 - CVE-2025-26751 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-26751

Vulnerability Analysis

The Alphabetic Pagination plugin fails to sanitize and escape input parameters before reflecting them in HTTP responses. When a victim visits a crafted URL targeting the vulnerable endpoint, the unescaped payload is rendered as part of the page DOM and executed by the browser.

Reflected XSS requires user interaction (UI:R), typically achieved through phishing emails, malicious links on third-party sites, or social engineering. No authentication is required to craft the exploit URL (PR:N), and the attack is delivered over the network (AV:N).

The changed scope (S:C) reflects that script execution occurs within the browser context of the authenticated WordPress user. If the victim holds administrator privileges, attackers can pivot to plugin installation, account creation, or theft of session cookies and nonces.

Root Cause

The root cause is missing output encoding on user-controllable request parameters. The plugin echoes input back into HTML without applying WordPress escaping functions such as esc_html(), esc_attr(), or esc_url(). This violates the standard WordPress security practice of escaping late and escaping often.

Attack Vector

An attacker constructs a URL containing a JavaScript payload in a vulnerable parameter handled by the plugin. The attacker distributes the link through phishing or social channels. When a logged-in WordPress user follows the link, the browser executes the injected script under the site's origin, exposing cookies, local storage, and the authenticated session.

The vulnerability is described in prose only because no verified proof-of-concept code has been published. Refer to the Patchstack Vulnerability Advisory for additional technical context.

Detection Methods for CVE-2025-26751

Indicators of Compromise

Web server access logs containing URL parameters with HTML or JavaScript syntax such as <script>, onerror=, or javascript: directed at Alphabetic Pagination endpoints.
Unexpected outbound requests from administrator browsers to attacker-controlled domains following clicks on inbound links.
Creation of new WordPress administrator accounts or unexpected plugin installations following suspicious referrer activity.

Detection Strategies

Inspect HTTP request and response pairs for reflected parameter values that contain unescaped angle brackets or event handler attributes.
Deploy a Web Application Firewall (WAF) rule set targeting reflected XSS patterns on WordPress plugin query strings.
Correlate referrer headers with administrator session activity to identify suspicious cross-site link traversal.

Monitoring Recommendations

Enable WordPress audit logging to capture privileged actions performed shortly after page navigation events.
Monitor for anomalous JavaScript execution patterns and DOM modifications using browser-side Content Security Policy (CSP) violation reports.
Track plugin inventory and version data across WordPress estates to identify hosts running Alphabetic Pagination <= 3.2.1.

How to Mitigate CVE-2025-26751

Immediate Actions Required

Identify all WordPress installations running Alphabetic Pagination version 3.2.1 or earlier.
Deactivate and remove the plugin if a patched release is not yet available or not required for site functionality.
Force password rotation and session invalidation for administrators who may have clicked unverified inbound links.

Patch Information

At the time of publication, the Patchstack advisory lists no fixed version. Site operators should consult the Patchstack Vulnerability Advisory for updates and apply any vendor-supplied release above 3.2.1 as soon as it becomes available.

Workarounds

Deploy a WAF rule blocking requests containing script tags or JavaScript event handlers in query parameters.
Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources.
Restrict administrator access to trusted networks and require multi-factor authentication to limit the impact of session theft.

bash

# Example WAF rule (ModSecurity) to block reflected XSS payloads
SecRule ARGS "@rx (?i)(<script|onerror=|javascript:|onload=)" \
    "id:1002675,phase:2,deny,status:403,log,\
    msg:'Possible reflected XSS targeting Alphabetic Pagination (CVE-2025-26751)'"