CVE-2025-55709 Overview
CVE-2025-55709 is a stored cross-site scripting (XSS) vulnerability in the Visual Composer Website Builder plugin for WordPress. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. Attackers with low-privileged authenticated access can inject malicious scripts that persist within the site and execute in the browsers of visitors or administrators who view the affected content. The issue affects all versions of Visual Composer Website Builder up to and including 45.15.0. Exploitation requires user interaction, and successful attacks can compromise session cookies, redirect users to malicious sites, or perform actions on behalf of the victim.
Critical Impact
Authenticated attackers can inject persistent JavaScript that executes in the context of any user viewing the affected page, enabling session theft and administrative account compromise.
Affected Products
- Visual Composer Website Builder plugin for WordPress
- All versions from unspecified initial release through 45.15.0
- WordPress sites running the vulnerable visualcomposer plugin
Discovery Timeline
- 2025-08-14 - CVE CVE-2025-55709 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-55709
Vulnerability Analysis
The vulnerability resides in Visual Composer Website Builder, a widely deployed WordPress page builder plugin. The plugin fails to properly sanitize or encode user-controlled input before rendering it in generated web pages. Because the payload is stored server-side, it executes each time a user renders the affected page or component. This is a stored (persistent) XSS, which is more impactful than reflected variants because it does not require targeted delivery of a crafted link.
Exploitation requires an authenticated account with content-authoring privileges and requires a victim to view the affected page or preview. The scope change indicates the injected script executes in a security context beyond the vulnerable component, typically the browser session of an administrator or site visitor.
Root Cause
The root cause is missing output encoding or input sanitization in one or more plugin fields that accept user input and later render it in HTML context. Values submitted through the page builder interface are stored and returned to the browser without stripping or escaping HTML control characters, allowing <script> tags or event-handler attributes to execute.
Attack Vector
An attacker with contributor-level or higher privileges submits a crafted payload through a Visual Composer editor field. The payload is stored in the WordPress database and reintroduced into the rendered HTML when a victim loads the page. Because the plugin does not enforce output encoding, the browser parses the injected content as executable JavaScript.
No verified public exploit code is available for this vulnerability. See the Patchstack XSS Vulnerability Advisory for additional technical context.
Detection Methods for CVE-2025-55709
Indicators of Compromise
- Unexpected <script> tags, javascript: URIs, or on* event-handler attributes stored in WordPress wp_posts or wp_postmeta tables tied to Visual Composer content.
- Outbound requests from visitor browsers to unfamiliar domains after loading pages built with Visual Composer.
- New or modified administrator accounts following viewing sessions by privileged users.
Detection Strategies
- Audit Visual Composer content fields for HTML tags, encoded script payloads, and suspicious inline event handlers.
- Review WordPress access logs for POST requests to Visual Composer editor endpoints originating from low-privilege accounts.
- Deploy Content Security Policy (CSP) reporting to surface script executions from untrusted origins.
Monitoring Recommendations
- Monitor plugin update status and flag WordPress installations running Visual Composer versions at or below 45.15.0.
- Alert on privilege escalation events, particularly new administrator role assignments following authenticated content edits.
- Enable web application firewall logging for requests carrying script tags or JavaScript event handlers to WordPress admin endpoints.
How to Mitigate CVE-2025-55709
Immediate Actions Required
- Update Visual Composer Website Builder to a version later than 45.15.0 as soon as a patched release is available from the vendor.
- Audit existing pages, templates, and reusable blocks created with Visual Composer for injected scripts and remove any suspicious content.
- Review authenticated user accounts with content-authoring privileges and revoke access for unrecognized or dormant accounts.
Patch Information
Refer to the Patchstack XSS Vulnerability Advisory for current patch availability and vendor guidance. Apply the fixed version through the WordPress plugin manager once released.
Workarounds
- Restrict content-authoring privileges to trusted users only; do not grant contributor or author roles to untrusted accounts.
- Deploy a web application firewall with rules that block requests containing script tags or JavaScript event handlers targeting Visual Composer endpoints.
- Implement a strict Content Security Policy that disallows inline script execution to reduce the impact of successful injection.
- Disable or uninstall the Visual Composer plugin on sites where it is not actively required until a patch is applied.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
