CVE-2025-24630: Sikshya LMS Reflected XSS Vulnerability

CVE-2025-24630 Overview

CVE-2025-24630 is a Reflected Cross-Site Scripting (XSS) vulnerability in the MantraBrain Sikshya LMS WordPress plugin. This vulnerability stems from improper neutralization of user 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 execute arbitrary JavaScript in authenticated user sessions, potentially leading to session hijacking, credential theft, or unauthorized actions on behalf of legitimate users within WordPress learning management environments.

Affected Products

• MantraBrain Sikshya LMS WordPress Plugin version 0.0.21 and earlier
• WordPress installations running vulnerable Sikshya LMS versions
• Learning management system deployments utilizing the Sikshya plugin

Discovery Timeline

• 2025-02-03 - CVE-2025-24630 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-24630

Vulnerability Analysis

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

Reflected XSS attacks require user interaction, typically through clicking a specially crafted malicious link. When a victim clicks the link, the malicious payload is sent to the vulnerable server, which then reflects the unsanitized input back to the browser where it executes within the context of the authenticated session.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and output encoding within the Sikshya LMS plugin. User-controllable input is incorporated into the page response without proper sanitization or encoding, allowing HTML and JavaScript injection. This typically occurs when request parameters are directly echoed into the page content without escaping special characters like <, >, ", and '.

Attack Vector

The attack vector for this vulnerability is network-based, requiring an attacker to craft a malicious URL containing the XSS payload and convince a victim to click the link. When the victim, who may be an authenticated WordPress administrator or LMS user, clicks the malicious link, the injected script executes with the same privileges as the victim. This can enable attackers to:

• Steal session cookies and authentication tokens
• Perform actions on behalf of the authenticated user
• Modify page content to display phishing forms
• Redirect users to malicious external sites

The vulnerability exploits the trust relationship between the user's browser and the legitimate WordPress domain, making detection difficult for end users.

Detection Methods for CVE-2025-24630

Indicators of Compromise

• Unusual URL parameters containing encoded JavaScript or HTML tags in access logs targeting Sikshya LMS endpoints
• Browser console errors indicating blocked script execution if Content Security Policy is in place
• Anomalous user account activity following interaction with suspicious links
• Reports from users about unexpected behavior after clicking links to LMS pages

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block common XSS payloads in URL parameters
• Monitor HTTP access logs for suspicious patterns including <script>, javascript:, and encoded variants like %3Cscript%3E
• Deploy browser-based security controls that alert on potential XSS attempts
• Utilize SIEM correlation rules to identify patterns of reflected XSS attack attempts

Monitoring Recommendations

• Enable detailed access logging on WordPress installations and review logs for suspicious query strings
• Configure alerting for unusual patterns in URL parameters accessing Sikshya LMS functionality
• Monitor for any reported Content Security Policy violations that may indicate XSS attempts
• Implement user behavior analytics to detect anomalous session activity following link clicks

How to Mitigate CVE-2025-24630

Immediate Actions Required

• Update the Sikshya LMS plugin to a version newer than 0.0.21 when a patched version becomes available
• Temporarily disable the Sikshya LMS plugin if it is not critical to operations until a fix is released
• Implement a Web Application Firewall (WAF) with XSS protection rules as a compensating control
• Educate users about the risks of clicking untrusted links, especially those with complex URL parameters

Patch Information

Refer to the Patchstack Vulnerability Report for the latest patch information and remediation guidance from the security researchers who identified this vulnerability. Monitor the WordPress plugin repository for updates to the Sikshya LMS plugin addressing this security issue.

Workarounds

• Deploy Content Security Policy (CSP) headers to restrict inline script execution and mitigate XSS impact
• Use a WAF with aggressive XSS filtering rules targeting URL parameters processed by the Sikshya LMS plugin
• Restrict access to WordPress administrative functions to trusted IP addresses only
• Implement HTTP-only and Secure flags on session cookies to limit the impact of potential session hijacking

# WordPress .htaccess configuration to add basic security headers
# Add to your WordPress root .htaccess file

<IfModule mod_headers.c>
    # Content Security Policy to mitigate XSS attacks
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'"
    
    # XSS Protection header for legacy browser support
    Header set X-XSS-Protection "1; mode=block"
    
    # Prevent content type sniffing
    Header set X-Content-Type-Options "nosniff"
</IfModule>