CVE-2026-90498: lenve vhr Authentication Bypass Vulnerability

CVE-2026-90498 Overview

CVE-2026-90498 affects lenve vhr version 1.0-SNAPSHOT, an open-source human resources management application. The vulnerability resides in the vhr.sql initialization file, which provisions the application database with default credentials. Attackers can authenticate remotely using these known credentials without any user interaction. The issue is classified under [CWE-1392: Use of Default Credentials]. The vendor was contacted about this disclosure but did not respond, and no patch is available at the time of publication.

Critical Impact

Remote attackers can log in to unmodified lenve vhr deployments using publicly known default credentials embedded in the vhr.sql database seed file, gaining unauthorized access to HR data.

Affected Products

• lenve vhr version 1.0-SNAPSHOT
• Deployments provisioned using the shipped vhr.sql initialization script
• Any downstream fork retaining the default credential seed data

Discovery Timeline

• 2026-09-13 - CVE-2026-90498 published to the National Vulnerability Database (NVD)
• 2026-09-15 - Last updated in NVD database

Technical Details for CVE-2026-90498

Vulnerability Analysis

The vulnerability stems from default credentials seeded through the vhr.sql database initialization script distributed with lenve vhr 1.0-SNAPSHOT. When administrators deploy the application using the provided SQL file, the resulting database contains predictable administrative accounts with well-known passwords. These credentials are documented in the public source repository, so attackers do not need to guess or brute-force them.

Because the application exposes authentication endpoints over the network, an unauthenticated remote actor can log in directly. Successful authentication yields access to employee records, payroll data, and administrative functions handled by the HR platform. According to the referenced advisory, the exploit is publicly available.

Root Cause

The root cause is the inclusion of hardcoded administrative credentials in the shipped database seed file [CWE-1392]. The installation workflow does not force credential rotation on first login, and the documentation does not prominently instruct operators to change the default password. Deployments that follow the standard installation steps therefore inherit the same known credentials.

Attack Vector

An attacker locates an internet-exposed lenve vhr instance, submits the default username and password against the login endpoint, and receives an authenticated session. From there, the attacker can enumerate personnel data, modify records, or pivot into connected systems that trust the HR application. No privileges, tokens, or user interaction are required.

No verified exploit code is reproduced here. Refer to the GitHub Security Advisory VHR-VULN-008 for technical details.

Detection Methods for CVE-2026-90498

Indicators of Compromise

• Successful authentication events for the default admin account originating from external or unexpected IP ranges.
• Session creation immediately following the first HTTP request to the login endpoint, indicating no credential discovery phase.
• Bulk read operations against employee, payroll, or organizational tables shortly after login.

Detection Strategies

• Query the vhr database to identify accounts whose password hashes match the values seeded by vhr.sql.
• Review web server access logs for POST requests to the authentication endpoint followed by administrative API calls.
• Correlate authentication logs with threat intelligence feeds to flag logins from anonymization services or known scanning infrastructure.

Monitoring Recommendations

• Alert on any successful login using accounts created during initial database provisioning that have never had their password changed.
• Monitor for unusual off-hours access to HR record endpoints or bulk export operations.
• Enable audit logging on the database layer to capture direct queries against sensitive tables when the application server is bypassed.

How to Mitigate CVE-2026-90498

Immediate Actions Required

• Rotate all administrative and service account passwords provisioned by the vhr.sql script to strong, unique values.
• Restrict network exposure of the lenve vhr login interface to trusted internal networks or VPN users only.
• Audit existing accounts for unauthorized activity and revoke sessions established prior to the credential rotation.

Patch Information

No vendor patch is available. The advisory notes that the maintainer was contacted about this disclosure but did not respond. Operators should treat the deployment as unmaintained and apply compensating controls. Consult the VulDB CVE-2026-90498 entry for updates.

Workarounds

• Modify the vhr.sql initialization file before deployment to remove or replace default credential inserts with placeholder values requiring manual configuration.
• Place the application behind a reverse proxy that enforces additional authentication, such as mutual TLS or single sign-on.
• Implement web application firewall rules to block authentication attempts using the known default usernames from untrusted networks.

# Configuration example: rotate the default admin password directly in MySQL
mysql -u root -p vhr -e "UPDATE hr SET password = SHA2('<new-strong-password>', 256) WHERE username = 'admin';"