CVE-2025-22280 Overview
CVE-2025-22280 is a Missing Authorization vulnerability in the revmakx DefendWP Firewall plugin for WordPress. The flaw stems from incorrectly configured access control on plugin functionality, allowing authenticated users with low privileges to invoke restricted operations. The issue affects all versions of defend-wp-firewall up to and including 1.1.0. The vulnerability maps to [CWE-862: Missing Authorization]. A low-privileged authenticated attacker can exploit this flaw over the network without user interaction to compromise integrity of the firewall plugin configuration.
Critical Impact
An authenticated attacker with minimal privileges can bypass access controls to manipulate firewall functionality, potentially disabling protections on the WordPress site.
Affected Products
- revmakx DefendWP Firewall plugin (defend-wp-firewall)
- All versions through 1.1.0
- WordPress sites running the vulnerable plugin
Discovery Timeline
- 2025-02-27 - CVE-2025-22280 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-22280
Vulnerability Analysis
The DefendWP Firewall plugin exposes functionality without enforcing proper capability or role checks. WordPress plugins must validate that the calling user holds the required capability before executing privileged actions. The plugin omits or improperly implements these checks, leaving sensitive endpoints reachable by any authenticated user.
The vulnerability allows attackers with subscriber-level credentials, the lowest authenticated tier in WordPress, to invoke functionality intended for administrators. Because the plugin manages firewall rules and security policies, unauthorized invocation can degrade the site's security posture or enable follow-on attacks.
Root Cause
The root cause is the absence of authorization checks on one or more plugin actions. WordPress plugins typically rely on current_user_can() checks and nonce validation through check_ajax_referer() or check_admin_referer() to gate privileged actions. The plugin code path responsible for the affected functionality does not enforce a capability check appropriate to the sensitivity of the operation, qualifying it as a [CWE-862] Missing Authorization defect.
Attack Vector
Exploitation requires the attacker to hold valid low-privilege credentials on the target WordPress site. The attacker sends crafted HTTP requests to the vulnerable plugin endpoints, typically admin-ajax.php action handlers or REST API routes registered by the plugin. Because the endpoint accepts requests from any authenticated user, the action executes with the requesting user's session context but performs administrator-level changes. Refer to the Patchstack Vulnerability Report for additional technical context.
Detection Methods for CVE-2025-22280
Indicators of Compromise
- Unexpected modifications to DefendWP Firewall rules, allowlists, or blocklists.
- Subscriber or contributor accounts issuing POST requests to wp-admin/admin-ajax.php with DefendWP-specific action parameters.
- Disabled firewall protection events appearing in plugin or WordPress audit logs without an administrator action.
- New or modified plugin configuration entries in the wp_options table outside administrator sessions.
Detection Strategies
- Review web server access logs for low-privilege users invoking DefendWP admin actions or REST endpoints under /wp-json/.
- Correlate WordPress authentication logs with privileged plugin actions to identify role mismatches.
- Deploy a Web Application Firewall (WAF) rule that blocks requests to DefendWP plugin endpoints from non-administrator accounts.
Monitoring Recommendations
- Enable WordPress audit logging that records plugin setting changes and the acting user role.
- Alert on any non-administrator account triggering plugin management actions.
- Monitor file integrity for the wp-content/plugins/defend-wp-firewall/ directory and the WordPress options table.
How to Mitigate CVE-2025-22280
Immediate Actions Required
- Identify all WordPress installations running DefendWP Firewall version 1.1.0 or earlier.
- Disable the plugin if a patched version is not yet available for your environment.
- Audit user accounts and remove unused subscriber or contributor accounts that could be abused.
- Rotate credentials for any account flagged in suspicious activity logs.
Patch Information
No fixed version is referenced in the published advisory at the time of writing. Track the Patchstack Vulnerability Report and the plugin's WordPress.org listing for an updated release that adds capability checks to the affected endpoints.
Workarounds
- Deactivate and remove the DefendWP Firewall plugin until a patched release is available.
- Restrict registration on the WordPress site to limit the pool of low-privileged accounts that could exploit the flaw.
- Apply WAF rules that deny requests to DefendWP plugin AJAX or REST endpoints unless the session belongs to an administrator.
# Example: disable the vulnerable plugin via WP-CLI
wp plugin deactivate defend-wp-firewall
wp plugin delete defend-wp-firewall
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
