CVE-2026-3041: BaykeShop XSS Vulnerability

CVE-2026-3041 Overview

A Cross-Site Scripting (XSS) vulnerability has been identified in xingfuggz BaykeShop versions up to 1.3.20. The vulnerability exists within an unknown function in the file src/baykeshop/contrib/article/templates/baykeshop/sidebar/custom.html, which is part of the Article Sidebar Module. Manipulation of the sidebar.content argument allows attackers to inject malicious scripts, leading to cross-site scripting attacks that can be executed remotely.

Critical Impact

This stored XSS vulnerability in the Article Sidebar Module allows remote attackers with elevated privileges to inject malicious scripts that execute in the context of other users' browsers, potentially leading to session hijacking, credential theft, or unauthorized actions.

Affected Products

• xingfuggz BaykeShop up to version 1.3.20
• BaykeShop Article Sidebar Module (custom.html template)
• Installations utilizing the sidebar.content functionality

Discovery Timeline

• 2026-02-23 - CVE-2026-3041 published to NVD
• 2026-02-24 - Last updated in NVD database

Technical Details for CVE-2026-3041

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The flaw resides in the Article Sidebar Module's template rendering process, where the sidebar.content parameter is not properly sanitized before being rendered in the custom.html template.

The exploit has been publicly disclosed through a GitHub Issue report, and the project maintainers were notified early but have not yet responded. This lack of response increases the risk for organizations running affected versions, as no official patch is currently available.

Root Cause

The vulnerability stems from insufficient input validation and output encoding in the template file src/baykeshop/contrib/article/templates/baykeshop/sidebar/custom.html. When user-controlled data is passed through the sidebar.content argument, the application fails to properly sanitize or escape HTML/JavaScript content before rendering it in the browser. This allows attackers to inject arbitrary script content that will execute when other users view the affected page.

Attack Vector

The attack can be executed remotely over the network. An authenticated attacker with elevated privileges (such as administrative access to the sidebar content management) can inject malicious JavaScript code into the sidebar.content field. When this content is rendered for other users visiting pages with the Article Sidebar Module, the malicious scripts execute in their browser context.

The attack requires user interaction, as a victim must visit a page containing the poisoned sidebar content. Once executed, the injected scripts can perform actions such as stealing session cookies, capturing keystrokes, redirecting users to malicious sites, or performing actions on behalf of the victim.

Detection Methods for CVE-2026-3041

Indicators of Compromise

• Unexpected or obfuscated JavaScript code present in sidebar.content database fields
• Unusual HTML tags or script elements within article sidebar configurations
• Reports from users of unexpected browser behavior when viewing pages with custom sidebars
• Web server logs showing suspicious patterns in sidebar content modification requests

Detection Strategies

• Implement web application firewall (WAF) rules to detect XSS payload patterns in POST requests targeting sidebar configuration endpoints
• Deploy Content Security Policy (CSP) headers to detect and report inline script execution attempts
• Review database records for sidebar.content fields containing <script> tags, event handlers (e.g., onerror, onload), or javascript: pseudo-protocols
• Enable SentinelOne's browser protection capabilities to detect and block client-side script injection attacks

Monitoring Recommendations

• Monitor application logs for administrative changes to sidebar content, especially from unusual IP addresses or at unusual times
• Implement real-time alerting for any sidebar content modifications containing HTML or JavaScript syntax
• Track Content Security Policy violation reports to identify potential exploitation attempts
• Review audit logs for pattern changes in how sidebar content is being modified

How to Mitigate CVE-2026-3041

Immediate Actions Required

• Review and audit all existing sidebar.content entries in the database for malicious scripts
• Restrict access to sidebar content management to trusted administrators only
• Implement Content Security Policy (CSP) headers with strict script-src directives to prevent inline script execution
• Consider temporarily disabling the custom sidebar functionality until a patch is available

Patch Information

No official patch is currently available from the vendor. The project maintainers were notified through a GitHub Issue but have not yet responded. Organizations should monitor the BaykeShop GitHub repository for updates and apply patches as soon as they become available.

Additional vulnerability details are tracked in VulDB #347397.

Workarounds

• Manually sanitize the custom.html template by adding proper output encoding for the sidebar.content variable using Django's template auto-escaping or explicit escape filter
• Implement server-side input validation to strip or reject HTML/JavaScript content in sidebar configuration inputs
• Deploy a Web Application Firewall (WAF) with XSS protection rules to filter malicious input
• Restrict sidebar content management to a minimal set of trusted users with enhanced monitoring

# Example: Add Content Security Policy headers in nginx
# Add to your nginx server block configuration
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'none';" always;

# Alternative for Apache (.htaccess or httpd.conf)
# Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"