CVE-2024-54324: SMSify Plugin Reflected XSS Vulnerability

CVE-2024-54324 Overview

CVE-2024-54324 is a reflected Cross-Site Scripting (XSS) vulnerability in the mtomic SMSify plugin for WordPress. The flaw affects all versions of SMSify up to and including 6.0.4. The plugin fails to properly neutralize user-supplied input before reflecting it in generated web pages, enabling attackers to inject arbitrary JavaScript that executes in the victim's browser context.

The vulnerability is classified under [CWE-79] and carries a network-based attack vector requiring user interaction. Successful exploitation can lead to session hijacking, credential theft, and unauthorized actions performed on behalf of the targeted user.

Critical Impact

Attackers can execute arbitrary JavaScript in the browser of any user who clicks a crafted link, potentially leading to account takeover of WordPress administrators.

Affected Products

• mtomic SMSify WordPress plugin versions through 6.0.4
• WordPress sites with SMSify installed and activated
• Any browser session of users interacting with crafted SMSify URLs

Discovery Timeline

• 2024-12-13 - CVE-2024-54324 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-54324

Vulnerability Analysis

The vulnerability stems from improper neutralization of input during web page generation in the SMSify plugin. User-controlled data passed via HTTP request parameters is reflected back into the HTTP response without adequate output encoding or sanitization. When a victim follows an attacker-crafted URL, the injected payload executes within the WordPress site's origin.

Because the issue produces a scope change, the injected script runs with the privileges of the authenticated user viewing the page. An attacker targeting an administrator can leverage the access to perform privileged actions through the WordPress REST API or admin interface. The vulnerability impacts confidentiality, integrity, and availability of the affected site at a limited level per the published metrics.

Root Cause

The root cause is missing or insufficient output escaping when SMSify renders parameters back into HTML. Functions such as esc_html(), esc_attr(), or wp_kses() are not applied to attacker-controlled inputs prior to inclusion in the response body. The plugin trusts request data and emits it directly within HTML or JavaScript contexts.

Attack Vector

Exploitation requires the attacker to deliver a crafted URL to a victim through phishing, malicious advertising, or a third-party site. When the victim clicks the link while authenticated to the WordPress site, the injected payload executes in their browser. The reflected nature of the issue means the payload travels in the request and is echoed in the response, rather than being stored on the server. Refer to the Patchstack Vulnerability Report for additional technical context.

Detection Methods for CVE-2024-54324

Indicators of Compromise

• Web server access logs containing SMSify-related request parameters with HTML or JavaScript syntax such as <script>, onerror=, or javascript:.
• Unexpected outbound requests from administrator browsers shortly after clicking external links referencing the WordPress site.
• New or modified WordPress administrator accounts, plugins, or theme files lacking a corresponding audit trail.

Detection Strategies

• Inspect HTTP request and response pairs for SMSify endpoints to identify parameters reflected verbatim into HTML output.
• Deploy a web application firewall ruleset that flags common XSS payload patterns targeting WordPress plugin parameters.
• Correlate referrer headers and user-agent strings across SMSify requests to surface phishing campaigns delivering crafted URLs.

Monitoring Recommendations

• Monitor WordPress administrator session activity for anomalous API calls following navigation events to SMSify pages.
• Enable Content Security Policy (CSP) reporting to capture script execution from unexpected origins or inline contexts.
• Track plugin file integrity and review the WordPress audit log for privilege changes initiated from administrator accounts.

How to Mitigate CVE-2024-54324

Immediate Actions Required

• Disable or remove the SMSify plugin until a patched version above 6.0.4 is confirmed available from the vendor.
• Force a logout of all active WordPress sessions and require administrators to reauthenticate with rotated credentials.
• Audit administrator accounts, scheduled tasks, and recently modified plugin or theme files for unauthorized changes.

Patch Information

The advisory indicates the issue affects SMSify versions up to and including 6.0.4. Review the Patchstack Vulnerability Report for the current fixed-version status and upgrade guidance. Apply the vendor-supplied update as soon as it is released and validated in a staging environment.

Workarounds

• Deploy a web application firewall rule that blocks requests containing HTML or JavaScript metacharacters against SMSify endpoints.
• Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources for the WordPress administrative interface.
• Restrict administrative access to known IP ranges and require multi-factor authentication for all privileged WordPress accounts.

# Example WAF rule to block reflected XSS attempts against SMSify endpoints
SecRule REQUEST_URI "@contains /wp-content/plugins/smsify/" \
    "id:1054324,phase:2,deny,status:403,\
     chain,msg:'CVE-2024-54324 SMSify reflected XSS attempt'"
    SecRule ARGS "@rx (?i)(<script|onerror=|javascript:|onload=)" "t:none,t:urlDecodeUni"