CVE-2026-24620: Landing Page Builder Stored XSS Vulnerability

CVE-2026-24620 Overview

CVE-2026-24620 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the PluginOps Landing Page Builder plugin for WordPress. This vulnerability stems from improper neutralization of input during web page generation, allowing attackers with high-level privileges to inject malicious scripts that persist in the application and execute in victim browsers.

Critical Impact
Authenticated attackers can inject persistent malicious scripts that execute in the context of other users' sessions, potentially leading to session hijacking, credential theft, or malicious redirects affecting site visitors and administrators.

Affected Products

PluginOps Landing Page Builder plugin for WordPress versions through 1.5.3.3
WordPress installations with the page-builder-add plugin enabled

Discovery Timeline

2026-01-23 - CVE-2026-24620 published to NVD
2026-01-27 - Last updated in NVD database

Technical Details for CVE-2026-24620

Vulnerability Analysis

This Stored XSS vulnerability (CWE-79) allows attackers with elevated privileges to inject malicious JavaScript code that becomes permanently stored in the application database. When other users access the affected pages, the malicious script executes within their browser context, enabling a range of attacks including session token theft, keylogging, phishing overlay injection, and administrative account takeover.

The vulnerability requires high privileges (PR:H) and user interaction (UI:R), meaning an attacker needs authenticated access with elevated permissions, and a victim must view the infected content. However, the changed scope (S:C) indicates the vulnerability can impact resources beyond the vulnerable component, affecting the confidentiality, integrity, and availability of the broader WordPress installation.

Root Cause

The root cause of this vulnerability lies in insufficient input sanitization within the Landing Page Builder plugin. User-supplied input in page builder elements is not properly escaped or validated before being stored in the database and subsequently rendered in HTML output. This allows attackers to craft input containing JavaScript code that bypasses any client-side filtering and persists in the stored page content.

Attack Vector

The attack vector for CVE-2026-24620 is network-based, requiring no special network position. An authenticated attacker with sufficient privileges accesses the Landing Page Builder interface and injects malicious JavaScript code into page elements such as text fields, custom HTML blocks, or widget configurations. This malicious payload is stored in the WordPress database.

When administrators or site visitors view the affected landing page, the stored script executes in their browser context. The attacker can leverage this to steal session cookies, redirect users to phishing sites, modify page content dynamically, or perform actions on behalf of authenticated users.

The vulnerability mechanism involves inadequate output encoding when rendering user-controlled content. For detailed technical information, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-24620

Indicators of Compromise

Unexpected JavaScript code or <script> tags present in landing page content stored in the WordPress database
Unusual redirect behaviors or pop-ups on pages created with Landing Page Builder
Web server access logs showing requests with encoded script payloads targeting page builder endpoints
Reports from users experiencing unexpected browser behavior when visiting landing pages

Detection Strategies

Implement Web Application Firewall (WAF) rules to detect and block XSS payload patterns in requests to the Landing Page Builder plugin
Conduct regular database audits to identify stored content containing suspicious JavaScript patterns or event handlers
Deploy Content Security Policy (CSP) headers to detect and report inline script execution attempts
Utilize WordPress security plugins with malware scanning capabilities to identify injected scripts

Monitoring Recommendations

Enable detailed logging for WordPress admin actions, particularly those involving the Landing Page Builder plugin
Configure browser-based XSS auditors and CSP violation reporting to capture exploitation attempts
Monitor for unusual patterns in page edit activity, especially bulk modifications or edits by newly created accounts
Set up alerts for database modifications to tables associated with the page-builder-add plugin

How to Mitigate CVE-2026-24620

Immediate Actions Required

Update the PluginOps Landing Page Builder plugin to the latest patched version as soon as one becomes available
Review and audit all existing landing pages created with the plugin for malicious script injections
Temporarily disable the Landing Page Builder plugin if a patch is not yet available and the risk is deemed unacceptable
Implement strict Content Security Policy headers to mitigate the impact of any stored XSS payloads

Patch Information

Organizations should monitor the official WordPress plugin repository and the Patchstack advisory for patch availability. Update the plugin immediately when a security fix is released for versions beyond 1.5.3.3.

Workarounds

Restrict access to the Landing Page Builder plugin by limiting which user roles can create or edit landing pages
Implement a Web Application Firewall with XSS filtering rules to block malicious input before it reaches the application
Deploy Content Security Policy headers with strict script-src directives to prevent inline script execution
Conduct a manual review and sanitization of all content created with the plugin to remove any injected scripts

bash

# Example: Add Content Security Policy header in .htaccess for Apache
# This helps mitigate XSS by restricting script execution sources
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none';"