CVE-2024-53730: April's Call Posts CSRF Vulnerability

CVE-2024-53730 Overview

CVE-2024-53730 is a Cross-Site Request Forgery (CSRF) vulnerability [CWE-352] in the springthistle April's Call Posts WordPress plugin (aprils-call-posts). The flaw affects all versions up to and including 2.1.1. Attackers can chain the CSRF weakness with a Stored Cross-Site Scripting (XSS) payload, allowing malicious JavaScript to be persisted in the WordPress site through a forged administrator request.

Exploitation requires user interaction, typically tricking an authenticated administrator into visiting an attacker-controlled page. Successful exploitation results in stored script execution within the WordPress dashboard context, with limited impact on confidentiality, integrity, and availability.

Critical Impact
A successful CSRF-to-Stored-XSS chain can persist attacker-controlled JavaScript in the WordPress site, executing in the browsers of administrators and visitors who load the affected pages.

Affected Products

springthistle April's Call Posts plugin (aprils-call-posts) versions up to and including 2.1.1
WordPress installations running the vulnerable plugin
Administrator sessions authenticated to the affected WordPress site

Discovery Timeline

2024-12-02 - CVE-2024-53730 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2024-53730

Vulnerability Analysis

The April's Call Posts plugin exposes a state-changing endpoint that processes administrator actions without validating an anti-CSRF token. WordPress provides wp_nonce_field() and check_admin_referer() primitives to defend against this class of attack, but the affected handler does not enforce either. An attacker who can lure an authenticated administrator to a malicious page can issue a forged request that the plugin processes as legitimate.

The CSRF weakness becomes more impactful because the same handler stores user-supplied input without proper output encoding or sanitization. The injected payload is then rendered to subsequent visitors, producing a Stored XSS condition. Script execution occurs in the trust context of the WordPress origin, enabling session theft, administrative action abuse, and persistent backdooring of the admin interface.

The attack vector is network-based and requires user interaction, but no authentication on the attacker side. The scope changes because injected scripts execute in browsers belonging to other users of the WordPress site.

Root Cause

The root cause is missing CSRF protection [CWE-352] on a privileged plugin endpoint, combined with insufficient input sanitization on the data field that ultimately reaches the rendered DOM. Both defenses are required: a nonce alone would block the forged request, and proper output encoding would neutralize the XSS payload even if a request were processed.

Attack Vector

An attacker hosts a page containing an auto-submitting HTML form or fetch() call that targets the vulnerable plugin endpoint on the victim's WordPress site. When an authenticated administrator visits the page, the browser sends the request along with valid session cookies. The plugin accepts the request, stores the attacker-supplied script payload, and serves it to subsequent page loads as Stored XSS.

No verified proof-of-concept code is publicly available. Technical details are documented in the Patchstack WordPress Plugin Vulnerability advisory.

Detection Methods for CVE-2024-53730

Indicators of Compromise

Unexpected <script> tags or event handler attributes (onerror, onload) embedded in posts, settings, or plugin-managed content fields.
HTTP POST requests to aprils-call-posts plugin endpoints with Referer headers pointing to domains outside the WordPress site.
New or modified administrator accounts created shortly after an admin session visited an external page.
Outbound requests from administrator browsers to unfamiliar JavaScript hosting domains.

Detection Strategies

Review WordPress access logs for POST requests to plugin handlers that lack a valid nonce parameter or have an external Referer.
Scan the WordPress database, specifically wp_posts and plugin-specific tables, for HTML or JavaScript payloads stored in unexpected fields.
Inspect rendered pages for inline scripts that do not match known theme or plugin code.

Monitoring Recommendations

Enable web application firewall (WAF) logging for the /wp-admin/ path and alert on requests missing standard WordPress nonce parameters.
Monitor file integrity for the aprils-call-posts plugin directory to identify unauthorized modifications.
Track administrator session activity for anomalous actions performed immediately after browsing external URLs.

How to Mitigate CVE-2024-53730

Immediate Actions Required

Identify all WordPress sites running the April's Call Posts plugin at version 2.1.1 or earlier.
Deactivate the plugin until a patched release is confirmed installed.
Audit existing plugin-managed content for injected scripts and remove malicious payloads.
Rotate administrator credentials and invalidate active sessions if compromise is suspected.

Patch Information

At the time of NVD publication, no fixed version is identified in the advisory. Site operators should consult the Patchstack advisory and the WordPress plugin repository for any release that addresses the issue, and update immediately once available.

Workarounds

Remove or deactivate the aprils-call-posts plugin until a fixed version is released.
Restrict /wp-admin/ access by source IP through web server or WAF rules to reduce CSRF exposure.
Deploy a Content Security Policy (CSP) that disallows inline scripts to limit Stored XSS execution.
Require administrators to use isolated browser profiles dedicated to WordPress administration.

bash

# Example: disable the vulnerable plugin via WP-CLI
wp plugin deactivate aprils-call-posts
wp plugin delete aprils-call-posts