CVE-2025-1672 Overview
CVE-2025-1672 is a Stored Cross-Site Scripting (XSS) vulnerability in the Notibar – Notification Bar for WordPress plugin. The flaw affects all versions up to and including 2.1.5. It stems from insufficient input sanitization and output escaping in the plugin's admin settings. Authenticated attackers with administrator-level permissions can inject arbitrary JavaScript that executes when users visit affected pages. The vulnerability only impacts WordPress multi-site installations and installations where the unfiltered_html capability has been disabled. The issue is tracked under [CWE-79] and was patched in the plugin repository via a WordPress plugin changeset.
Critical Impact
Authenticated administrators on multi-site installations can inject persistent JavaScript, enabling session hijacking, redirection, and further compromise of site visitors.
Affected Products
- Notibar – Notification Bar for WordPress plugin versions ≤ 2.1.5
- WordPress multi-site installations running the affected plugin
- WordPress single-site installations where unfiltered_html has been disabled
Discovery Timeline
- 2025-03-06 - CVE-2025-1672 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-1672
Vulnerability Analysis
The Notibar plugin allows administrators to configure notification bar content through its admin settings page. The plugin fails to properly sanitize user-supplied input on save and does not escape stored values on output. Attacker-supplied HTML and JavaScript are persisted in the WordPress database and rendered directly into pages containing the notification bar.
When a visitor loads a page rendering the notification bar, the browser executes the injected script in the site's origin context. This enables session token theft, administrative action forgery, arbitrary redirects, and drive-by content injection against every visitor to the site.
The attack requires an authenticated account with administrator privileges. In default WordPress single-site installations, administrators already possess the unfiltered_html capability, which legitimately permits raw HTML entry. The security boundary only exists where that capability is removed — namely on WordPress Multisite, where only Super Admins hold unfiltered_html by default, and on hardened installations that explicitly revoke the capability.
Root Cause
The root cause is missing input sanitization on save and missing output escaping on render inside the plugin's admin settings handler. Functions such as sanitize_text_field(), wp_kses(), or esc_html() were not applied to the notification bar content before it was stored or echoed into page markup.
Attack Vector
An authenticated administrator on an affected multi-site or hardened installation navigates to the Notibar plugin settings and submits a payload containing a <script> tag or an event handler such as onerror. The payload is persisted in the site database. Any subsequent page load that renders the notification bar executes the script under the affected site's origin. On multisite deployments, this permits a subordinate site administrator to attack Super Admins and other users across the network.
No verified public exploit code is available. Refer to the Wordfence Vulnerability Report and the WordPress Changeset Update for technical details on the fix.
Detection Methods for CVE-2025-1672
Indicators of Compromise
- Unexpected <script> tags, onerror, onload, or onmouseover handlers stored in Notibar plugin options within the wp_options table.
- Outbound requests from visitor browsers to unfamiliar domains originating from pages that render the notification bar.
- New or modified administrator accounts appearing shortly after suspicious admin settings changes.
Detection Strategies
- Audit the plugin's stored settings in the WordPress database for HTML or JavaScript syntax that should not be present in notification bar text.
- Review WordPress audit logs for update_option events targeting Notibar settings performed by administrator accounts.
- Inspect rendered page HTML on public pages to identify inline script injected inside the notification bar markup.
Monitoring Recommendations
- Enable a WordPress activity logging plugin to record all administrator setting changes with user attribution and timestamps.
- Monitor web server logs for POST requests to wp-admin/options.php and admin-ajax.php associated with the Notibar plugin.
- Alert on anomalous administrator logins, especially on multisite networks where subordinate site admins rarely change plugin settings.
How to Mitigate CVE-2025-1672
Immediate Actions Required
- Update the Notibar – Notification Bar for WordPress plugin to a version newer than 2.1.5 that includes the fix from the WordPress Changeset Update.
- Review Notibar plugin settings across all sites in the network and remove any unexpected HTML or JavaScript content.
- Rotate credentials and session tokens for any administrator account suspected of compromise.
Patch Information
The vendor addressed the vulnerability by adding proper input sanitization and output escaping in the plugin's admin settings handler. The fix is available in the plugin repository as documented in the Notibar Plugin Developer Info page. Site operators should upgrade through the WordPress plugin manager or by deploying the patched release manually.
Workarounds
- Deactivate the Notibar plugin until the patched version can be deployed across all affected sites.
- Restrict administrator access on multisite networks so only trusted Super Admins can modify plugin settings.
- Deploy a Web Application Firewall (WAF) rule that blocks HTML and script payloads submitted to Notibar admin endpoints.
# Configuration example: upgrade the Notibar plugin using WP-CLI
wp plugin update notibar --version=latest
wp plugin list --name=notibar --fields=name,status,version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
