CVE-2025-32274: WP w3all phpBB CSRF Vulnerability

CVE-2025-32274 Overview

CVE-2025-32274 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the wp-w3all-phpbb-integration WordPress plugin developed by axew3. The flaw affects all plugin versions up to and including 2.9.8. An attacker can craft a malicious web page that, when visited by an authenticated WordPress user, triggers unauthorized state-changing requests within the plugin. The issue is tracked under CWE-352: Cross-Site Request Forgery. Successful exploitation requires user interaction, such as clicking a crafted link while authenticated to the target site.

Critical Impact
An attacker can trick an authenticated WordPress user into submitting forged requests to the vulnerable plugin, resulting in limited integrity impact on the target application.

Affected Products

axew3 WP w3all phpBB Integration plugin for WordPress
All versions from initial release through 2.9.8
WordPress sites integrating phpBB via the wp-w3all-phpbb-integration plugin

Discovery Timeline

2025-04-04 - CVE-2025-32274 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-32274

Vulnerability Analysis

The plugin exposes state-changing actions without adequate CSRF protection. WordPress provides a nonce mechanism through functions such as wp_nonce_field() and check_admin_referer() to validate the origin of requests. When these controls are missing or improperly implemented, an attacker can craft a request that a browser will send with the victim's active session cookies. The plugin processes the request as if it originated from a legitimate user action. Exploitation requires the victim to visit an attacker-controlled page while authenticated. The vulnerability produces limited integrity impact, with no direct confidentiality or availability consequences per the published CVSS vector.

Root Cause

The root cause is the absence or improper validation of anti-CSRF tokens on sensitive plugin endpoints. Without a bound, verified nonce, the plugin cannot distinguish between a request initiated by the authenticated user through the WordPress admin interface and a request forged by a third-party site. This class of flaw is documented as CWE-352.

Attack Vector

Exploitation follows the standard CSRF pattern. The attacker hosts a page containing an auto-submitting HTML form or an image tag that targets a vulnerable plugin endpoint on the victim's WordPress site. When the authenticated administrator or privileged user loads the attacker page, the browser attaches the session cookies for the WordPress domain and submits the forged request. The plugin executes the requested action because it does not validate a CSRF token. Refer to the Patchstack advisory for CVE-2025-32274 for further technical context.

Detection Methods for CVE-2025-32274

Indicators of Compromise

Unexpected configuration changes within the wp-w3all-phpbb-integration plugin settings.
HTTP POST requests to plugin endpoints containing Referer headers pointing to external, untrusted domains.
Administrator sessions performing plugin actions shortly after visiting external links or email attachments.

Detection Strategies

Inspect web server access logs for requests to wp-admin/admin.php or plugin-specific endpoints with mismatched Origin or Referer headers.
Enable WordPress audit logging to record plugin setting changes and correlate them with user activity.
Deploy a web application firewall (WAF) rule that flags state-changing requests to the plugin lacking a valid WordPress nonce parameter.

Monitoring Recommendations

Monitor administrator account activity for actions performed outside normal working hours or from unusual browser sessions.
Alert on modifications to the plugin's database options and any newly created phpBB integration mappings.
Track outbound links opened by privileged WordPress users through email security gateways.

How to Mitigate CVE-2025-32274

Immediate Actions Required

Identify all WordPress installations running wp-w3all-phpbb-integration version 2.9.8 or earlier.
Restrict administrative access to trusted networks and require re-authentication for sensitive plugin actions.
Instruct privileged users to log out of WordPress sessions when not actively administering the site.

Patch Information

At the time of publication, the vendor advisory indexed by Patchstack lists all versions through 2.9.8 as affected. Administrators should monitor the plugin's WordPress.org listing for a fixed release and apply the update as soon as it is available.

Workarounds

Deactivate and remove the wp-w3all-phpbb-integration plugin until a patched version is released.
Deploy WAF rules that enforce the presence of a valid _wpnonce parameter on state-changing plugin requests.
Configure the browser SameSite=Lax or SameSite=Strict attribute on WordPress session cookies to reduce cross-origin cookie transmission.

bash

# Example: identify installations of the vulnerable plugin across managed WordPress sites
find /var/www -type d -name "wp-w3all-phpbb-integration" -exec \
  grep -H "Version:" {}/wp-w3all-phpbb-integration.php \;