Security Alert Summary
The Wp Js Detect plugin for WordPress has a Cross-Site Request Forgery (CSRF) vulnerability (CVE-2026-9731) affecting versions up to and including 1.0.9. Missing or incorrect nonce validation in the plugin_settings function can allow an attacker to update the plugin’s notification text and CSS settings via a forged request if a site administrator is tricked into performing an action such as clicking a link.
CVE Details
- CVE ID: CVE-2026-9731
- Affected plugin / component: Wp Js Detect (plugin_settings function)
- Affected versions: All versions up to and including 1.0.9
- Published: July 8, 2026 at 6:16:23 AM UTC
- Last modified: July 8, 2026 at 2:55:07 PM UTC
- CVSS v3.1: Base Score 4.3, MEDIUM —
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Authentication / privileges / user interaction: Authentication not required (unauthenticated attackers); Privileges required: None; User interaction: Required
- Primary impact: Confidentiality: None; Integrity: Low (unauthorized modification of notification text/CSS); Availability: None
- CWE / weakness: CWE-352 (Cross-Site Request Forgery)
Technical Details
The plugin fails to perform proper nonce validation in the plugin_settings function. Because the nonce check is missing or incorrect, an attacker can craft a forged request that updates the settings wp_non_js_notification_text and wp_non_js_notification_css. Those settings are echoed on the frontend without escaping, which allows injected content to be rendered to site visitors.
The vulnerability exists specifically due to the missing/incorrect nonce verification around the settings update path. Successful exploitation requires tricking a user with sufficient privileges (for example, a site administrator) into triggering the forged request (user interaction is required).
Impact is limited to modification of the plugin’s notification content and CSS; the CVSS vector and the description indicate integrity impact only, not disclosure of confidential data or direct availability impact.
How This Could Impact Your Website
Consider a site with multiple users: a site owner, internal content editors, and an external contractor who helps with administration. If an administrator is lured to click a crafted link, an attacker could alter the plugin notification text or inject CSS and HTML that is displayed to all visitors. Practical consequences include:
- Site visitors and staff seeing misleading or malicious content on the frontend, which can undermine trust or brand reputation.
- Increased risk of targeted phishing or social engineering, since injected content can be used to display fake messages or links that appear legitimate.
- Misleading interface elements that could result in users taking unsafe actions or disclosing credentials to attackers through deceptive forms or links.
If youre unsure whether your site is affected or how to assess your current user roles and plugins, it may be worth having a professional review.
Recommended Actions
- Update the affected plugin as soon as a patched version is available.
- Review and reduce unnecessary user roles, especially contributors and any users with administrative capabilities.
- Enforce strong passwords and enable two-factor authentication for editors and administrators.
- Remove unused or unmaintained plugins from your site.
- Monitor site activity and logs for unusual behavior, including unexpected settings changes or content edits.
If youd like help reviewing your plugins, user roles, or overall WordPress security posture, our team at Freshy is happy to help.
References
- https://plugins.trac.wordpress.org/browser/wp-js-detect/trunk/wp-js-detect.php#L190
- https://plugins.trac.wordpress.org/browser/wp-js-detect/trunk/wp-js-detect.php#L192
- https://plugins.trac.wordpress.org/browser/wp-js-detect/trunk/wp-js-detect.php#L193
- https://plugins.trac.wordpress.org/browser/wp-js-detect/trunk/wp-js-detect.php#L250
- https://www.wordfence.com/threat-intel/vulnerabilities/id/afca7b14-f3bb-4612-b81c-bde120b380ba?source=cve
