CVE-2024-37540 Overview
CVE-2024-37540 is a Cross-Site Request Forgery (CSRF) vulnerability [CWE-352] in the ZEEN101 Leaky Paywall plugin for WordPress. The flaw affects all versions of leaky-paywall up to and including 4.21.2. An attacker can trick an authenticated user into submitting a forged request that performs unintended state-changing actions in the plugin. Exploitation requires user interaction, such as clicking a crafted link or visiting a malicious page while authenticated to the target WordPress site. The vulnerability was published to the National Vulnerability Database on January 2, 2025.
Critical Impact
A successful CSRF attack against an authenticated WordPress user can modify plugin state or configuration without the user's consent, leading to limited integrity impact on affected sites.
Affected Products
- ZEEN101 Leaky Paywall WordPress plugin (leaky-paywall)
- All versions from n/a through 4.21.2
- WordPress sites with the vulnerable plugin installed and active
Discovery Timeline
- 2025-01-02 - CVE-2024-37540 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-37540
Vulnerability Analysis
The Leaky Paywall plugin exposes one or more state-changing endpoints that do not properly validate the origin of incoming requests. The plugin fails to enforce anti-CSRF protections, such as verifying a WordPress nonce via check_admin_referer() or wp_verify_nonce() on privileged actions. An attacker who lures an authenticated site user to a malicious page can cause the browser to submit an authenticated request to the vulnerable endpoint. The browser automatically attaches the user's session cookies, and the plugin processes the request as legitimate.
The vulnerability requires user interaction, which limits its automated exploitation but does not eliminate risk. Phishing emails, malicious advertisements, and forum posts can all deliver the CSRF payload. See the Patchstack Vulnerability Report for additional technical details.
Root Cause
The root cause is missing or insufficient CSRF token validation on plugin request handlers. WordPress provides nonce mechanisms specifically to defend against CSRF, but the affected code paths in Leaky Paywall versions through 4.21.2 do not enforce them consistently on state-changing operations.
Attack Vector
The attack vector is network-based and requires user interaction. An attacker hosts a page containing an HTML form or JavaScript that auto-submits a request to the target WordPress site. When an authenticated user visits the attacker-controlled page, the browser issues the request with the victim's cookies attached, and the plugin performs the requested action under the victim's identity.
No verified public exploit code is available for this CVE. Refer to the referenced advisory for further technical detail.
Detection Methods for CVE-2024-37540
Indicators of Compromise
- Unexpected changes to Leaky Paywall configuration, subscription levels, or plugin settings
- WordPress access logs showing state-changing POST requests to leaky-paywall endpoints with external Referer or Origin headers
- Administrator or editor account activity originating from unusual IP addresses or during off-hours
- Audit log entries for plugin actions that authenticated users deny performing
Detection Strategies
- Review WordPress and web server access logs for POST requests to plugin endpoints where the Referer header does not match the site's own domain
- Enable WordPress audit logging plugins to capture plugin setting changes and correlate with user session data
- Compare current Leaky Paywall configuration against a known-good baseline to identify unauthorized modifications
Monitoring Recommendations
- Alert on state-changing requests to wp-admin/admin.php and plugin-specific handlers that lack a valid nonce parameter
- Monitor for outbound clicks from WordPress admin sessions to untrusted domains, which may indicate CSRF lure delivery
- Track version metadata for the leaky-paywall plugin across managed WordPress sites and flag installations at or below 4.21.2
How to Mitigate CVE-2024-37540
Immediate Actions Required
- Update the Leaky Paywall plugin to a version later than 4.21.2 as soon as the vendor publishes a fixed release
- Audit WordPress user accounts and remove or downgrade privileges for accounts that do not require administrative access
- Instruct administrators and editors to log out of WordPress when not actively managing the site to reduce exposure to CSRF lures
Patch Information
Update leaky-paywall to a version above 4.21.2 once the vendor publishes a patched release. Consult the Patchstack Vulnerability Report for the current fix status and mitigation guidance.
Workarounds
- Deploy a web application firewall (WAF) rule that blocks POST requests to Leaky Paywall endpoints when the Referer or Origin header is missing or not from the site's own domain
- Restrict WordPress administrative access to trusted IP ranges using web server access controls
- Deactivate the Leaky Paywall plugin until a patched version is available if the plugin is not business-critical
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
