CVE-2026-1161: pbrong HRMS 1.0.1 XSS Vulnerability

CVE-2026-1161 Overview

A Cross-Site Scripting (XSS) vulnerability has been identified in pbrong hrms version 1.0.1, a Human Resource Management System. The vulnerability exists in the UpdateRecruitmentById function within the /handler/recruitment.go file. Improper input sanitization allows attackers to inject malicious scripts that execute in the context of other users' browsers when they interact with the affected recruitment functionality.

Critical Impact

Attackers can inject malicious JavaScript code through the recruitment update functionality, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of authenticated users.

Affected Products

• pbrong hrms 1.0.1

Discovery Timeline

• 2026-01-19 - CVE CVE-2026-1161 published to NVD
• 2026-01-19 - Last updated in NVD database

Technical Details for CVE-2026-1161

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 Go-based web application's recruitment management module. When processing updates to recruitment records via the UpdateRecruitmentById function, the application fails to properly sanitize user-supplied input before incorporating it into dynamically generated web pages.

The network-accessible nature of this vulnerability means that an authenticated attacker with low privileges can remotely exploit this flaw. However, successful exploitation requires user interaction—specifically, a victim must view the page containing the injected malicious payload. The impact is primarily on the integrity of web content displayed to users, as the attacker can modify page content or execute scripts in the victim's browser context.

Root Cause

The root cause of this vulnerability is the absence of proper input validation and output encoding in the UpdateRecruitmentById function located in /handler/recruitment.go. User-controlled data submitted through the recruitment update endpoint is directly rendered in the HTML response without being sanitized or escaped. This allows specially crafted input containing JavaScript or HTML code to be interpreted and executed by the victim's browser rather than being treated as plain text.

Attack Vector

The attack is executed remotely over the network against the web application. An attacker with valid credentials (low privileges required) can craft a malicious request to update recruitment data, embedding JavaScript payloads in vulnerable input fields. When another user—potentially an administrator—views the modified recruitment record, the malicious script executes in their browser session. This stored XSS attack pattern means the payload persists in the application and affects all users who access the compromised recruitment entry.

The vulnerability requires user interaction (the victim must navigate to the affected page), but once triggered, the attacker can potentially:

• Steal session cookies and authentication tokens
• Perform actions on behalf of the victim user
• Redirect users to malicious websites
• Capture sensitive information displayed on the page

Detection Methods for CVE-2026-1161

Indicators of Compromise

• Unusual or encoded JavaScript content in recruitment database records
• Unexpected <script> tags or event handlers (e.g., onerror, onload) in stored recruitment data
• User reports of browser redirects or unexpected behavior when viewing recruitment pages
• Web application firewall logs showing XSS attack patterns in POST requests to /handler/recruitment.go endpoints

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common XSS payloads in HTTP requests
• Implement Content Security Policy (CSP) headers to prevent inline script execution and report violations
• Monitor application logs for suspicious input patterns containing HTML/JavaScript elements in recruitment update requests
• Conduct regular security scans of stored database content for XSS payloads

Monitoring Recommendations

• Enable detailed logging for all recruitment-related API endpoints, particularly UpdateRecruitmentById operations
• Configure alerts for CSP violation reports that may indicate XSS injection attempts
• Monitor for anomalous authentication activity that could result from session hijacking
• Review web server access logs for unusual request patterns targeting the recruitment handler

How to Mitigate CVE-2026-1161

Immediate Actions Required

• Restrict access to the recruitment management functionality to only essential personnel until a patch is available
• Implement a Web Application Firewall with XSS protection rules in front of the hrms application
• Review and sanitize existing recruitment records in the database for any malicious content
• Enable Content Security Policy headers with strict directives to limit script execution

Patch Information

No official patch information has been provided by the vendor at this time. Organizations should monitor the VulDB entry and the GitHub issue discussion for updates on remediation guidance.

Workarounds

• Implement server-side input validation to reject requests containing HTML or JavaScript content in recruitment fields
• Apply output encoding (HTML entity encoding) when rendering recruitment data in web pages
• Deploy a reverse proxy or WAF to filter malicious input before it reaches the application
• Consider temporarily disabling the recruitment update functionality if the risk is deemed unacceptable

# Example: Add Content-Security-Policy header in nginx configuration
# Add to your server block to help mitigate XSS impact
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; style-src 'self' 'unsafe-inline';" always;

# Example: Implement request filtering for common XSS patterns
# Note: This is a basic mitigation and not a complete fix
location /handler/recruitment.go {
    if ($args ~* "(<script|javascript:|onerror=|onload=)") {
        return 403;
    }
    proxy_pass http://backend;
}