CVE-2025-39450 Overview
CVE-2025-39450 is a DOM-Based Cross-Site Scripting (XSS) vulnerability in the Crocoblock JetTabs plugin for WordPress. The flaw results from improper neutralization of input during web page generation [CWE-79]. All versions of JetTabs up to and including 2.2.7 are affected.
Exploitation requires an authenticated user with low privileges and user interaction, such as clicking a crafted link. A successful attack executes arbitrary JavaScript in the victim's browser within the context of the vulnerable WordPress site.
Critical Impact
Attackers with low-privileged accounts can inject client-side scripts that execute in administrators' browsers, enabling session theft, content manipulation, and pivoting into higher-privileged accounts.
Affected Products
- Crocoblock JetTabs for WordPress — all versions up to and including 2.2.7
- WordPress sites with authenticated low-privileged users and JetTabs installed
- Elementor-based pages leveraging JetTabs widgets
Discovery Timeline
- 2025-05-19 - CVE-2025-39450 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-39450
Vulnerability Analysis
The vulnerability stems from JetTabs failing to sanitize or encode attacker-controlled input before writing it into the Document Object Model (DOM). Because the sink executes in the browser, the malicious payload never needs to be stored on the server for persistent effect during the session.
DOM-based XSS differs from reflected or stored variants in that the payload flows from a client-side source, such as location.hash or document.URL, into a dangerous sink like innerHTML or document.write. Server-side filters cannot observe or block the payload because it is never sent to the backend.
The scope-changed CVSS vector indicates the impact extends beyond the vulnerable component into the containing page and user session. Confidentiality, integrity, and availability each take a limited impact as script execution is bound to the victim browser.
Root Cause
User-controllable data passed through JetTabs widget rendering is inserted into the DOM without proper encoding or safe-sink usage. The plugin trusts input that an authenticated contributor or editor can influence through widget configuration or URL parameters.
Attack Vector
An authenticated attacker crafts a URL or JetTabs widget configuration containing JavaScript. When an administrator or other user loads the resulting page, the browser renders the attacker payload within the trusted origin. The attacker can then exfiltrate cookies, perform actions on behalf of the victim, or deface content. Technical details are documented in the Patchstack XSS Vulnerability Report.
Detection Methods for CVE-2025-39450
Indicators of Compromise
- Unexpected <script> tags, javascript: URIs, or event handler attributes stored in JetTabs widget configurations or page metadata
- Administrator sessions originating from unfamiliar IP addresses shortly after visiting pages containing JetTabs widgets
- Outbound browser requests to attacker-controlled domains referenced by payloads embedded in JetTabs pages
Detection Strategies
- Audit WordPress post, page, and postmeta tables for JetTabs widget JSON containing script sinks or encoded JavaScript
- Review web server logs for requests to JetTabs-enabled URLs containing suspicious query strings, hash fragments, or encoded <script> payloads
- Deploy a Content Security Policy (CSP) in report-only mode to surface inline script execution originating from JetTabs widgets
Monitoring Recommendations
- Monitor WordPress audit logs for widget edits performed by contributor or editor accounts
- Alert on creation of new administrator accounts or role changes following JetTabs widget modifications
- Track plugin version inventory across WordPress estates to confirm all JetTabs installations remain above the fixed version once released
How to Mitigate CVE-2025-39450
Immediate Actions Required
- Update Crocoblock JetTabs to a version above 2.2.7 once the vendor publishes a patched release
- Restrict JetTabs widget editing privileges to trusted administrator accounts
- Enforce multi-factor authentication for all WordPress users with content-editing roles
Patch Information
As of the latest NVD update on 2026-06-17, affected versions include JetTabs through 2.2.7. Administrators should consult the Patchstack advisory for current fix availability and upgrade guidance from Crocoblock.
Workarounds
- Temporarily disable or uninstall JetTabs on sites that cannot be isolated until a patched version is applied
- Deploy a Web Application Firewall (WAF) rule to block requests containing script tags or JavaScript URIs targeting JetTabs endpoints
- Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to known hosts
# Example strict Content-Security-Policy header for WordPress (Apache)
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.
