CVE-2025-22675: Alert Box Block WordPress Plugin XSS Flaw

CVE-2025-22675 Overview

CVE-2025-22675 is a stored Cross-Site Scripting (XSS) vulnerability in the bPlugins Alert Box Block WordPress plugin. The flaw affects all versions of alert-box-block up to and including 1.1.0. The plugin fails to properly neutralize user-supplied input during web page generation, allowing authenticated attackers to inject persistent JavaScript payloads that execute in the browsers of other users viewing affected pages.

The issue is classified under [CWE-79], Improper Neutralization of Input During Web Page Generation. Exploitation requires low-privilege authentication and user interaction, but the impact crosses security scopes because injected scripts execute in victim browser contexts.

Critical Impact
Authenticated contributors can inject persistent JavaScript that executes when administrators or other users render the compromised alert block, enabling session theft, account takeover, and further site compromise.

Affected Products

bPlugins Alert Box Block – Display notice/alerts in the front end
WordPress installations running alert-box-block plugin versions through 1.1.0
Sites where low-privilege users can create or edit posts containing the Alert Box block

Discovery Timeline

2025-02-04 - CVE-2025-22675 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-22675

Vulnerability Analysis

The Alert Box Block plugin renders user-supplied content inside notice and alert components on the WordPress front end. The plugin accepts block attributes and content from the editor without applying sufficient output encoding or sanitization before rendering. An attacker with contributor-level access or higher can craft an alert block containing HTML and JavaScript payloads that persist in the database and execute whenever a user loads the page.

Because the payload is stored, exploitation does not require a specially crafted link or repeated social engineering. Any visitor rendering the affected content triggers the script in their authenticated session context. The CVSS scope change reflects that injected scripts execute in a browser trust boundary separate from the vulnerable plugin itself.

Root Cause

The root cause is missing or incomplete input neutralization in the block's rendering path. WordPress provides functions such as wp_kses_post, esc_html, and esc_attr for sanitizing block content, but the plugin does not apply them consistently to all attribute fields and inner content before echoing them to the DOM.

Attack Vector

Exploitation proceeds over the network against a WordPress site that has the vulnerable plugin installed. The attacker authenticates with an account that has post or block editing rights, inserts an Alert Box block containing a malicious HTML or JavaScript payload, and saves the post. When an administrator, editor, or site visitor loads the page containing the block, the injected script executes in their browser session.

Typical post-exploitation objectives include stealing authentication cookies, performing actions on behalf of higher-privileged users through the REST API, injecting cryptominers or redirect chains, and pivoting to full administrative takeover. See the Patchstack XSS Vulnerability Alert for the vendor-referenced advisory.

Detection Methods for CVE-2025-22675

Indicators of Compromise

Alert Box blocks containing <script> tags, on* event handlers, javascript: URIs, or encoded payload variants in wp_posts content.
Outbound browser requests from administrator sessions to unfamiliar domains shortly after loading pages with Alert Box blocks.
Unexpected creation of administrator accounts or plugin installations following visits to posts with the block.
New or modified rows in wp_users and wp_usermeta correlated with editor session activity on affected pages.

Detection Strategies

Query the WordPress database for alert-box-block block markup containing HTML event handlers or script tags using SQL patterns against post_content.
Monitor web server logs for POST requests to /wp-json/wp/v2/posts or /wp-admin/post.php from contributor-level accounts that include suspicious payload strings.
Deploy a Content Security Policy in report-only mode to surface inline script violations originating from post content.

Monitoring Recommendations

Alert on installations of alert-box-block at versions 1.1.0 or lower across managed WordPress fleets.
Track authenticated session anomalies for administrator accounts, including geographic changes and unusual REST API calls.
Log and review all block edits performed by contributor and author roles for high-value sites.

How to Mitigate CVE-2025-22675

Immediate Actions Required

Inventory all WordPress sites running the Alert Box Block plugin and identify installations at version 1.1.0 or earlier.
Update the plugin to a version above 1.1.0 once the vendor publishes a patched release.
Audit existing posts and pages for Alert Box blocks containing script payloads and remove or sanitize the affected content.
Rotate credentials and session tokens for any administrator account that may have loaded compromised pages.

Patch Information

At publication, the advisory indicates the vulnerability affects versions through 1.1.0. Administrators should consult the Patchstack XSS Vulnerability Alert and the plugin's official channel for the fixed release version and upgrade guidance.

Workarounds

Deactivate and remove the Alert Box Block plugin until a patched version is available.
Restrict post creation and editing capabilities to trusted accounts only, revoking contributor and author roles for untrusted users.
Deploy a Web Application Firewall rule that blocks common XSS payload patterns targeting block editor endpoints.
Implement a strict Content Security Policy that disallows inline scripts on front-end pages to limit payload execution.

bash

# Configuration example: deactivate the vulnerable plugin via WP-CLI
wp plugin deactivate alert-box-block
wp plugin delete alert-box-block

# Audit posts for suspicious block content
wp db query "SELECT ID, post_title FROM wp_posts WHERE post_content LIKE '%wp:alert-box-block%' AND (post_content LIKE '%<script%' OR post_content LIKE '%onerror=%' OR post_content LIKE '%javascript:%');"