CVE-2026-1598: Bdtask Bhojon XSS Vulnerability

CVE-2026-1598 Overview

A Cross-Site Scripting (XSS) vulnerability has been identified in Bdtask Bhojon All-In-One Restaurant Management System versions up to 20260116. The vulnerability exists in the User Information Module, specifically within the /dashboard/home/profile endpoint. An attacker can exploit this vulnerability by manipulating the fullname argument to inject malicious scripts, which can then be executed in the context of other users' browsers.

Critical Impact

This stored XSS vulnerability allows remote attackers to inject malicious scripts through user profile data, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of authenticated users within the restaurant management system.

Affected Products

• Bdtask Bhojon All-In-One Restaurant Management System up to version 20260116
• User Information Module (/dashboard/home/profile endpoint)

Discovery Timeline

• 2026-01-29 - CVE-2026-1598 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2026-1598

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 User Information Module's profile functionality, where user-supplied input through the fullname parameter is not properly sanitized before being rendered in the application's output.

The attack can be initiated remotely by an authenticated user with low privileges, requiring some user interaction for successful exploitation. The vulnerability primarily impacts the integrity of the application, allowing attackers to modify content displayed to other users. A proof-of-concept exploit has been made public, increasing the risk of active exploitation.

The vendor was contacted about this disclosure but did not respond, leaving users without an official patch or remediation guidance from Bdtask.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the User Information Module. When processing user profile updates, the application fails to properly sanitize the fullname field before storing it in the database and subsequently rendering it in the user interface. This allows script content to be persisted and executed when the profile data is displayed.

Attack Vector

The attack is network-based, requiring the attacker to have authenticated access to the system with low-level privileges. The exploitation flow involves:

1. An authenticated attacker navigates to the profile editing functionality at /dashboard/home/profile
2. The attacker submits a malicious JavaScript payload within the fullname parameter
3. The malicious script is stored in the application's database without proper sanitization
4. When other users (including administrators) view the attacker's profile or when the fullname is displayed elsewhere in the application, the malicious script executes in their browser context

This stored XSS attack can be used to steal session cookies, perform actions on behalf of victims, redirect users to malicious sites, or deface the application interface.

Detection Methods for CVE-2026-1598

Indicators of Compromise

• Unusual JavaScript or HTML tags present in user profile fullname fields in the database
• Encoded script payloads such as <script>, javascript:, or event handlers like onerror, onload in user-submitted data
• Unexpected outbound connections from user browsers when viewing profile pages
• Reports of session hijacking or unauthorized actions by authenticated users

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect XSS payload patterns in POST requests to /dashboard/home/profile
• Deploy application-layer monitoring to flag HTML/JavaScript content in the fullname parameter
• Review database entries for user profiles containing suspicious script tags or encoded payloads
• Monitor for anomalous user behavior that may indicate session compromise

Monitoring Recommendations

• Enable detailed logging for all profile modification requests, capturing full request bodies
• Set up alerts for multiple failed input validation attempts from the same user or IP
• Monitor for unusual patterns in user session activity that could indicate compromised accounts
• Review access logs for the /dashboard/home/profile endpoint for suspicious activity patterns

How to Mitigate CVE-2026-1598

Immediate Actions Required

• Implement strict input validation on the fullname parameter, allowing only alphanumeric characters and common name characters
• Apply context-appropriate output encoding when rendering user profile data in HTML, JavaScript, or URL contexts
• Deploy Content Security Policy (CSP) headers to mitigate the impact of successful XSS attacks
• Consider restricting access to the profile functionality until a permanent fix is applied
• Audit existing user profile data in the database for potentially malicious content

Patch Information

No official patch has been released by the vendor at this time. According to the vulnerability disclosure, the vendor (Bdtask) was contacted early about this issue but did not respond. Users should implement the workarounds below and monitor for future vendor communications.

For additional technical details, refer to the GitHub PoC Issue Report and VulDB entry #343360.

Workarounds

• Implement server-side input validation to strip or reject any HTML tags, JavaScript, or special characters from the fullname field
• Apply HTML entity encoding to all user-supplied data before rendering in web pages
• Deploy a Web Application Firewall with XSS protection rules enabled for the affected endpoint
• Implement Content Security Policy headers with strict script-src directives to prevent inline script execution
• Consider temporarily disabling the profile edit functionality for non-administrative users until proper sanitization is implemented

# Example Apache .htaccess configuration to add Content Security Policy header
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'none';"
    Header set X-Content-Type-Options "nosniff"
    Header set X-XSS-Protection "1; mode=block"
</IfModule>