CVE-2025-58821: WP Notification Bell Stored XSS Vulnerability

CVE-2025-58821 Overview

CVE-2025-58821 is a stored Cross-Site Scripting (XSS) vulnerability in the wpdever WP Notification Bell plugin for WordPress. The flaw affects all versions up to and including 1.4.6. It results from improper neutralization of user-supplied input during web page generation, classified as [CWE-79].

Exploitation requires an authenticated actor with high privileges and user interaction. A successful attack injects persistent JavaScript that executes in the browsers of users viewing affected pages. Because the scope is changed, injected scripts can affect resources beyond the vulnerable component.

Critical Impact
An authenticated attacker with high privileges can persist malicious JavaScript in the plugin's stored content, executing code in the context of any user rendering the affected pages.

Affected Products

wpdever WP Notification Bell plugin for WordPress
All versions from n/a through 1.4.6
WordPress sites with the wp-notification-bell plugin enabled

Discovery Timeline

2025-09-05 - CVE-2025-58821 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-58821

Vulnerability Analysis

The vulnerability is a stored XSS issue in the WP Notification Bell plugin. The plugin fails to properly neutralize input before storing it and rendering it back into the WordPress-generated HTML output. Any script payload persisted through the affected input field executes each time an administrator or user loads the affected page.

Stored XSS in a WordPress plugin can be used to hijack sessions, exfiltrate authentication cookies, or perform actions on behalf of a logged-in administrator. The changed scope in the CVSS vector indicates injected code can affect components beyond the vulnerable plugin itself, such as the WordPress admin dashboard.

The Exploit Prediction Scoring System (EPSS) currently places this issue in the lower percentile of likely-exploited vulnerabilities, and no public proof-of-concept is available.

Root Cause

The root cause is missing or insufficient output encoding and input sanitization on data handled by the plugin. WordPress provides functions such as esc_html(), esc_attr(), wp_kses(), and sanitize_text_field() for this purpose. The plugin does not apply these controls on the affected input path, allowing raw HTML and script tags to persist in storage.

Attack Vector

An attacker with a high-privilege WordPress account, such as an administrator or editor with access to plugin settings, submits a crafted payload through the vulnerable input. The payload is stored in the WordPress database. When another user loads a page that renders the stored content, the browser executes the injected JavaScript in the site's origin.

The vulnerability manifests when the plugin renders unsanitized stored input into the DOM. See the Patchstack XSS Vulnerability Advisory for technical details.

Detection Methods for CVE-2025-58821

Indicators of Compromise

Unexpected <script>, <iframe>, or event-handler attributes (for example onerror=, onclick=) stored in wp_options, wp_postmeta, or plugin-specific tables
Outbound requests from browser sessions to unfamiliar domains immediately after loading pages that render WP Notification Bell content
New or modified WordPress administrator accounts created shortly after suspicious plugin configuration changes

Detection Strategies

Query the WordPress database for stored plugin values containing HTML tags or JavaScript keywords such as <script, javascript:, or on\w+= event handlers
Review WordPress audit logs for changes to WP Notification Bell settings by high-privilege accounts
Inspect rendered admin pages with browser developer tools for scripts not originating from expected plugin assets

Monitoring Recommendations

Enable a WordPress activity log plugin to record settings changes and content edits by privileged users
Forward web server access logs and WordPress logs to a centralized data lake for correlation and retrospective search
Monitor for anomalous administrative behavior such as off-hours logins or bulk configuration updates

How to Mitigate CVE-2025-58821

Immediate Actions Required

Identify all WordPress installations running the wp-notification-bell plugin and confirm version 1.4.6 or earlier
Update the plugin to a fixed version once released by the vendor, or deactivate and remove it until a patch is available
Audit administrator and editor accounts, rotate credentials, and enforce multi-factor authentication for privileged users
Review plugin settings and stored data for malicious payloads and remove any suspicious entries

Patch Information

At the time of the NVD entry, the vulnerability affects versions up to and including 1.4.6. Consult the Patchstack XSS Vulnerability Advisory for the latest fixed version and vendor guidance.

Workarounds

Deactivate the WP Notification Bell plugin until a patched version is installed
Restrict access to plugin configuration by limiting the number of accounts with administrator or editor roles
Deploy a web application firewall (WAF) with rules that block XSS payloads targeting WordPress admin endpoints
Enforce a strict Content Security Policy (CSP) to reduce the impact of injected inline scripts

bash

# Example: locate and deactivate the vulnerable plugin using WP-CLI
wp plugin list --name=wp-notification-bell --field=version
wp plugin deactivate wp-notification-bell
wp plugin delete wp-notification-bell