CVE-2025-49054: Time Sheets Plugin XSS Vulnerability

CVE-2025-49054 Overview

CVE-2025-49054 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the Time Sheets WordPress plugin developed by mrdenny. This vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that execute in the context of a victim's browser session.

Critical Impact

Attackers can exploit this reflected XSS vulnerability to steal session cookies, hijack user accounts, redirect users to malicious sites, or perform unauthorized actions on behalf of authenticated WordPress administrators.

Affected Products

• WordPress Time Sheets plugin version 2.1.3 and earlier
• All WordPress installations running vulnerable versions of the time-sheets plugin

Discovery Timeline

• 2025-08-14 - CVE-2025-49054 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-49054

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Time Sheets plugin fails to properly sanitize user-supplied input before reflecting it back in the generated HTML response, creating an opportunity for attackers to inject arbitrary JavaScript code.

Reflected XSS vulnerabilities in WordPress plugins are particularly dangerous because they can be exploited against authenticated administrators. When an admin clicks a malicious link crafted by an attacker, the injected script executes with the privileges of that admin session, potentially allowing full site compromise.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and output encoding within the Time Sheets plugin. User-controlled parameters are directly incorporated into the page output without proper sanitization or escaping, violating the security principle of treating all user input as untrusted.

WordPress provides built-in functions such as esc_html(), esc_attr(), and wp_kses() for properly escaping output, but these safeguards were not adequately implemented in the affected code paths of the Time Sheets plugin.

Attack Vector

The attack vector for this reflected XSS vulnerability involves social engineering to trick a victim into clicking a specially crafted URL. The malicious payload is embedded in URL parameters and reflected in the server's response without proper sanitization.

A typical attack scenario involves:

1. Attacker crafts a malicious URL containing JavaScript payload in a vulnerable parameter
2. Attacker distributes the link via phishing email, social media, or compromised websites
3. Victim clicks the link while authenticated to the WordPress site
4. The malicious script executes in the victim's browser context
5. Attacker can steal session tokens, perform CSRF attacks, or modify page content

Due to the nature of reflected XSS, no malicious code is stored on the server—the attack relies entirely on the victim clicking the malicious link. For detailed technical information, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-49054

Indicators of Compromise

• Suspicious URL parameters containing encoded JavaScript or HTML tags in requests to Time Sheets plugin endpoints
• Unusual access patterns to Time Sheets plugin pages with malformed query strings
• Browser console errors related to Content Security Policy violations on affected pages
• Unexpected outbound connections from user browsers after visiting plugin pages

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block XSS payloads in URL parameters
• Monitor web server access logs for requests containing common XSS patterns such as <script>, javascript:, or encoded variants
• Implement Content Security Policy (CSP) headers to restrict script execution and report violations
• Use WordPress security plugins that scan for known vulnerable plugin versions

Monitoring Recommendations

• Enable detailed logging for all requests to the /wp-content/plugins/time-sheets/ directory
• Configure alerting for requests containing suspicious character sequences in query parameters
• Monitor for failed CSP policy reports indicating attempted XSS exploitation
• Review WordPress audit logs for any unauthorized administrative actions following suspicious requests

How to Mitigate CVE-2025-49054

Immediate Actions Required

• Identify all WordPress installations using the Time Sheets plugin version 2.1.3 or earlier
• Disable or deactivate the Time Sheets plugin until a patched version is available
• Implement WAF rules to filter XSS payloads targeting the plugin's endpoints
• Educate administrators about the risks of clicking untrusted links while authenticated

Patch Information

Organizations should monitor the official WordPress plugin repository and the developer's channels for a security update addressing this vulnerability. Until a patch is released, consider the following protective measures:

• Check for updates via the WordPress admin dashboard under Plugins → Installed Plugins
• Subscribe to security advisories from Patchstack for update notifications
• Evaluate alternative time tracking plugins if the vulnerability remains unpatched

Workarounds

• Restrict access to WordPress admin areas using IP allowlisting to reduce attack surface
• Implement strict Content Security Policy headers to mitigate XSS impact even if exploitation occurs
• Use browser extensions that block JavaScript execution on untrusted pages
• Consider temporarily removing the plugin if time sheet functionality is not critical to operations

# Example: Add CSP header via .htaccess to mitigate XSS impact
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none';"
</IfModule>