CVE-2024-54340: Simple Presenter XSS Vulnerability

CVE-2024-54340 Overview

CVE-2024-54340 is a reflected cross-site scripting (XSS) vulnerability in the sylviavanos Simple Presenter WordPress plugin. The flaw affects all versions up to and including 1.5.1. It stems from improper neutralization of user-supplied input during web page generation [CWE-79]. Attackers can craft malicious URLs that, when clicked by an authenticated or unauthenticated visitor, execute arbitrary JavaScript in the victim's browser session. Because the vulnerability scope is changed, injected scripts can affect resources beyond the vulnerable component. The issue was published to the National Vulnerability Database on December 13, 2024.

Critical Impact
A successful exploit allows attackers to execute arbitrary JavaScript in a victim's browser, enabling session hijacking, credential theft, and unauthorized actions within the WordPress site context.

Affected Products

sylviavanos Simple Presenter WordPress plugin versions through 1.5.1
WordPress sites with the simple-presenter plugin installed and active
Any user (including site administrators) who clicks a crafted link while browsing an affected site

Discovery Timeline

2024-12-13 - CVE-2024-54340 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2024-54340

Vulnerability Analysis

The Simple Presenter plugin fails to properly sanitize or encode user-controlled input before reflecting it back into HTTP responses. This classic reflected XSS pattern [CWE-79] allows an attacker to embed JavaScript payloads within URL parameters that the plugin renders directly into the resulting HTML page. The vulnerability requires user interaction, typically through a phishing link or malicious referrer.

The changed scope indicates that the injected script can break out of the vulnerable component's security context. This expands the blast radius beyond the plugin itself to other WordPress components, cookies, and authenticated sessions. An attacker successfully exploiting this flaw can read session tokens, perform CSRF-style actions on behalf of the victim, deface plugin output, or pivot to administrator-level account takeover if a logged-in admin triggers the payload.

Root Cause

The plugin accepts input from HTTP request parameters and writes that input into rendered HTML without applying WordPress sanitization helpers such as esc_html(), esc_attr(), or wp_kses(). Missing output encoding allows angle brackets, quotes, and <script> tags supplied by an attacker to be interpreted as executable markup by the browser.

Attack Vector

Exploitation occurs over the network and requires no authentication. The attacker constructs a URL pointing to a vulnerable Simple Presenter endpoint, embedding a JavaScript payload in a reflected parameter. The attacker then delivers the URL through phishing email, malicious advertisement, or compromised third-party content. When the victim clicks the link, the plugin reflects the payload into the page and the browser executes it under the WordPress site's origin.

Refer to the Patchstack WordPress Vulnerability advisory for additional technical context.

Detection Methods for CVE-2024-54340

Indicators of Compromise

HTTP request logs containing <script>, javascript:, onerror=, or onload= substrings within query parameters directed at Simple Presenter plugin paths
Unusual outbound requests from administrator browser sessions following navigation to crafted plugin URLs
New or modified WordPress administrator accounts created shortly after admin users visit suspicious external links
Referrer headers from attacker-controlled domains preceding requests to /wp-content/plugins/simple-presenter/ resources

Detection Strategies

Inspect web server access logs for URL-encoded XSS payloads (%3Cscript%3E, %22onerror%3D) targeting Simple Presenter endpoints
Deploy a Web Application Firewall (WAF) rule set that flags reflected XSS patterns on WordPress request paths
Run plugin inventory scans across managed WordPress sites to identify installations of simple-presenter at version 1.5.1 or earlier

Monitoring Recommendations

Centralize WordPress access logs and alert on requests containing common XSS signatures
Monitor administrator session activity for unexpected privilege changes or content modifications after link clicks
Track WordPress plugin version drift and alert when vulnerable versions of simple-presenter appear in inventory

How to Mitigate CVE-2024-54340

Immediate Actions Required

Deactivate and remove the Simple Presenter plugin until a patched version is confirmed available
Audit all WordPress sites in your estate for the presence of simple-presenter version 1.5.1 or earlier
Force password resets and session invalidation for administrator accounts that may have clicked suspicious links
Apply WAF rules that block reflected XSS payloads targeting /wp-content/plugins/simple-presenter/ paths

Patch Information

No fixed version is identified in the vendor advisory at publication. The Patchstack advisory confirms the issue affects versions through 1.5.1. Site operators should monitor the WordPress plugin repository for an updated release and apply it immediately when published.

Workarounds

Remove the Simple Presenter plugin from active WordPress installations until a patch is released
Implement a Content Security Policy (CSP) header restricting inline script execution and limiting script sources to trusted origins
Enable WAF protections such as Patchstack, Wordfence, or equivalent virtual patching services that block known XSS exploitation patterns
Train administrators to avoid clicking unsolicited links pointing to their own WordPress site with unusual query parameters

bash

# Configuration example: nginx rule to block common reflected XSS payloads
# targeting the Simple Presenter plugin path
location ~* /wp-content/plugins/simple-presenter/ {
    if ($args ~* "(<|%3C)script|javascript:|onerror=|onload=") {
        return 403;
    }
}

# Content Security Policy header to limit inline script execution
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'";