CVE-2024-23519: Email Before Download CSRF Vulnerability

CVE-2024-23519 Overview

CVE-2024-23519 is a Cross-Site Request Forgery (CSRF) vulnerability in the M&S Consulting Email Before Download plugin for WordPress. The flaw affects all plugin versions up to and including 6.9.7. An attacker can craft a malicious web page that, when visited by an authenticated administrator, submits unauthorized state-changing requests to the WordPress site. The vulnerability is tracked under CWE-352 and is documented in the Patchstack CSRF Vulnerability Report.

Critical Impact
Successful exploitation lets attackers perform privileged actions on the WordPress site by abusing the trusted session of an authenticated administrator, leading to confidentiality, integrity, and availability impact.

Affected Products

M&S Consulting Email Before Download (WordPress plugin)
Versions from n/a through 6.9.7
WordPress installations running the vulnerable plugin

Discovery Timeline

2024-02-29 - CVE-2024-23519 published to NVD
2025-01-08 - Last updated in NVD database

Technical Details for CVE-2024-23519

Vulnerability Analysis

The Email Before Download plugin processes administrative requests without verifying their origin. The plugin lacks proper CSRF token validation on sensitive state-changing endpoints. An attacker exploits this by tricking an authenticated administrator into loading attacker-controlled content while their WordPress session is active.

The browser automatically attaches the administrator's session cookies to forged requests. WordPress accepts these requests as legitimate because no anti-CSRF nonce is checked. This permits modification of plugin settings or other administrative actions tied to the plugin's functionality. The attack requires user interaction such as clicking a crafted link or visiting a malicious page.

Root Cause

The root cause is missing or insufficient CSRF protection on plugin request handlers. WordPress provides wp_nonce_field() and check_admin_referer() primitives, but the affected handlers in versions up to 6.9.7 do not enforce these checks. This omission classifies the issue under CWE-352: Cross-Site Request Forgery.

Attack Vector

Exploitation occurs over the network and requires user interaction from an authenticated administrator. The attacker hosts a malicious HTML page containing an auto-submitting form or scripted request targeting the vulnerable plugin endpoint. When the administrator visits the page while logged into WordPress, the browser sends the forged request with valid session cookies. The plugin processes the request as authorized. The Patchstack advisory provides further technical context on the affected request flow.

Detection Methods for CVE-2024-23519

Indicators of Compromise

Unexpected modifications to Email Before Download plugin configuration or stored settings
Administrative requests to plugin endpoints with Referer headers pointing to external or untrusted domains
Plugin actions logged with no corresponding administrator activity in browser or session history
New or modified email templates, download rules, or recipient lists that administrators did not configure

Detection Strategies

Review WordPress access logs for POST requests to plugin endpoints missing valid nonce parameters
Correlate plugin configuration changes with authenticated administrator session activity
Inspect HTTP Referer and Origin headers on plugin admin requests for off-site sources
Monitor browser-side telemetry on administrator workstations for outbound requests to suspicious domains immediately preceding plugin changes

Monitoring Recommendations

Enable WordPress audit logging plugins to capture all setting changes with timestamps and user attribution
Forward web server and WordPress logs to a centralized SIEM for correlation and alerting
Alert on plugin setting modifications occurring outside of expected change windows
Track administrator browser sessions for cross-origin form submissions targeting /wp-admin/ endpoints

How to Mitigate CVE-2024-23519

Immediate Actions Required

Update the M&S Consulting Email Before Download plugin to a version later than 6.9.7 once a fixed release is available
Audit current plugin configuration for unauthorized changes and restore known-good settings
Require administrators to log out of WordPress sessions when not actively managing the site
Restrict /wp-admin/ access by IP allowlist where operationally feasible

Patch Information

Review the Patchstack CSRF Vulnerability Report for the latest vendor patch status. No vendor advisory URL is listed in the NVD record. Administrators should verify the plugin's WordPress repository page for any release beyond 6.9.7 that addresses CWE-352.

Workarounds

Deactivate and remove the Email Before Download plugin until a patched version is published
Deploy a Web Application Firewall (WAF) rule that enforces Origin and Referer header validation on plugin admin endpoints
Use a security plugin that adds nonce verification or CSRF protection at the WordPress request layer
Limit administrator accounts to dedicated browsers or browser profiles isolated from general web browsing

bash

# Configuration example: WAF rule concept to block cross-origin POSTs to wp-admin
# (adapt syntax to your WAF/reverse proxy)
if ($request_method = POST) {
    if ($http_origin !~* "^https?://your-wordpress-domain\.com$") {
        return 403;
    }
}