CVE-2025-6540 Overview
CVE-2025-6540 is a Stored Cross-Site Scripting (XSS) vulnerability in the web-cam plugin for WordPress developed by murtuzamakda52. The flaw affects all versions up to and including 3.0. It stems from insufficient input sanitization and output escaping on the slug parameter. Authenticated users with Contributor-level access or higher can inject arbitrary JavaScript that executes in the browser of any visitor who loads the affected page. The issue is classified under CWE-79.
Critical Impact
Authenticated contributors can persist arbitrary JavaScript into WordPress pages, enabling session theft, administrative action hijacking, and site defacement against any visitor.
Affected Products
- murtuzamakda52 web-cam plugin for WordPress, all versions through 3.0
- WordPress sites running the plugin with Contributor-level accounts enabled
- Any site visitor rendering a page containing the injected slug payload
Discovery Timeline
- 2025-06-26 - CVE-2025-6540 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-6540
Vulnerability Analysis
The web-cam plugin accepts user-supplied content via the slug parameter without applying sufficient sanitization on input or escaping on output. When the plugin later renders the stored value inside a page context, the browser interprets attacker-controlled characters as HTML and JavaScript. Because the payload is persisted server-side, exploitation is not transient. Every subsequent visitor who loads the affected page triggers the injected script in their session.
The attack scope changes from the vulnerable component to the browser DOM, which is why the CVSS vector reports a Changed scope. Impact is limited to confidentiality and integrity of client-side data such as cookies, authenticated sessions, and rendered page content.
Root Cause
The root cause is improper neutralization of input during web page generation [CWE-79]. The plugin treats the slug parameter as safe text, bypassing WordPress helpers such as sanitize_text_field(), wp_kses(), or esc_html() on the output path. The fix is tracked in the upstream WordPress Plugin Changeset.
Attack Vector
An attacker authenticates to WordPress with at least Contributor privileges, which many blogs grant to external writers. The attacker submits content that assigns a malicious payload to the slug parameter handled by the plugin. The payload is written to the database and later echoed into page markup without escaping. When an administrator or visitor views the page, the script executes in their browser session, potentially performing authenticated requests on their behalf.
The vulnerability manifests in the plugin's slug-handling path. No verified proof-of-concept code is published; refer to the Wordfence Vulnerability Report for technical analysis.
Detection Methods for CVE-2025-6540
Indicators of Compromise
- Pages or post metadata associated with the web-cam plugin containing <script> tags, on* event handlers, or javascript: URIs in the slug field
- Unexpected outbound requests from administrator browsers to attacker-controlled domains after visiting plugin-rendered pages
- Contributor accounts creating or modifying web-cam plugin content outside normal editorial activity
Detection Strategies
- Query the WordPress database for plugin records where the slug column contains HTML control characters such as <, >, or &#
- Inspect rendered HTML of pages generated by the plugin for script tags that do not match the site's expected markup
- Correlate Contributor account logins with subsequent administrator session anomalies in web server logs
Monitoring Recommendations
- Enable WordPress audit logging for content creation and edits by non-Editor roles
- Monitor web server access logs for POST requests to plugin endpoints originating from newly registered accounts
- Alert on Content Security Policy (CSP) violation reports referencing inline script execution on plugin-rendered pages
How to Mitigate CVE-2025-6540
Immediate Actions Required
- Deactivate and remove the web-cam plugin until a patched release is confirmed available
- Audit all Contributor and higher accounts and remove any that are unused or unverified
- Review existing plugin content for malicious payloads and purge affected records from the database
Patch Information
No fixed version is listed in NVD at the time of publication. All versions through 3.0 remain vulnerable. The upstream code change is tracked in the WordPress Plugin Changeset. Site owners should consult the Web Cam Plugin Developer Info page for release updates and apply any patched version as soon as it is published.
Workarounds
- Restrict account registration and limit Contributor-level privileges to trusted editorial staff only
- Deploy a Web Application Firewall (WAF) rule that blocks HTML and JavaScript metacharacters in requests targeting plugin endpoints
- Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
# Content Security Policy header example for WordPress
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.