CVE-2026-22616: Eaton IPP Auth Bypass Vulnerability

CVE-2026-22616 Overview

CVE-2026-22616 is a weak authentication vulnerability affecting Eaton Intelligent Power Protector (IPP) software. The vulnerability exists in the web interface login page, which fails to implement sufficient rate-limiting controls. This security weakness allows attackers to perform repeated authentication attempts without restriction, enabling brute-force attacks against user credentials.

Eaton Intelligent Power Protector is power management software used in enterprise environments to monitor and manage uninterruptible power supplies (UPS) and other power infrastructure. The lack of rate-limiting on the authentication endpoint exposes organizations to credential compromise through automated password guessing attacks.

Critical Impact

Attackers can conduct unlimited brute-force authentication attempts against the IPP web interface, potentially compromising administrative credentials and gaining unauthorized access to critical power infrastructure management systems.

Affected Products

• Eaton Intelligent Power Protector (IPP) software (versions prior to the latest patched release)

Discovery Timeline

• April 16, 2026 - CVE-2026-22616 published to NVD
• April 16, 2026 - Last updated in NVD database

Technical Details for CVE-2026-22616

Vulnerability Analysis

This vulnerability is classified as CWE-307 (Improper Restriction of Excessive Authentication Attempts). The Eaton IPP web interface does not adequately limit the number of authentication attempts that can be made against the login page. Without proper rate-limiting mechanisms, the application allows an attacker to submit an unlimited number of login requests in rapid succession.

The network-accessible nature of this vulnerability means that any attacker with network access to the IPP web interface can attempt to exploit it without requiring prior authentication or user interaction. The vulnerability affects both confidentiality and integrity aspects of the system, as successful exploitation could lead to unauthorized access and potential manipulation of power management configurations.

Root Cause

The root cause of this vulnerability lies in the absence of defensive mechanisms against brute-force attacks in the IPP authentication subsystem. The login functionality lacks implementation of:

• Account lockout policies after consecutive failed attempts
• Progressive delays between authentication attempts
• CAPTCHA or similar challenge-response mechanisms
• IP-based request throttling

These missing controls allow automated tools to systematically enumerate passwords without triggering any defensive responses from the application.

Attack Vector

The attack vector is network-based, requiring the attacker to have network connectivity to the IPP web interface. An attacker would typically:

1. Identify the IPP web interface endpoint exposed on the network
2. Deploy automated brute-force tools such as Hydra, Burp Suite Intruder, or custom scripts
3. Submit thousands of authentication requests with different password combinations
4. Monitor responses to identify successful authentication attempts
5. Use compromised credentials to access the power management system

The vulnerability does not require privileges or user interaction, making it straightforward to exploit in environments where the IPP web interface is accessible. For detailed technical information, refer to the Eaton Security Bulletin ETN-VA-2025-1025.

Detection Methods for CVE-2026-22616

Indicators of Compromise

• Abnormally high volume of HTTP POST requests to the IPP login endpoint from a single source IP
• Repeated failed authentication events in IPP logs with consistent time intervals
• Multiple authentication attempts for different usernames from the same IP address in a short timeframe
• Network traffic patterns showing automated request sequences typical of brute-force tools

Detection Strategies

• Implement log analysis rules to detect excessive failed login attempts within defined time windows
• Deploy network intrusion detection systems (NIDS) with signatures for common brute-force attack patterns
• Configure SIEM alerts for authentication anomalies on IPP web interface endpoints
• Monitor for known brute-force tool user-agent strings in web server logs

Monitoring Recommendations

• Establish baseline authentication metrics and alert on significant deviations
• Enable detailed logging on the IPP web interface to capture source IP, timestamp, and authentication results
• Implement real-time monitoring of authentication failure rates across all IPP deployments
• Correlate authentication logs with network flow data to identify distributed brute-force attempts

How to Mitigate CVE-2026-22616

Immediate Actions Required

• Update Eaton Intelligent Power Protector to the latest version available from the Eaton download centre
• Restrict network access to the IPP web interface using firewall rules and network segmentation
• Implement strong, unique passwords for all IPP user accounts
• Deploy a web application firewall (WAF) with brute-force protection in front of the IPP interface
• Enable account lockout policies at the network or WAF level if not available in the application

Patch Information

Eaton has released a security update that addresses this rate-limiting vulnerability. The patched version of Eaton IPP is available for download from the official Eaton download centre. Organizations should review the Eaton Security Bulletin ETN-VA-2025-1025 for specific version information and upgrade instructions.

Workarounds

• Place the IPP web interface behind a reverse proxy with rate-limiting capabilities such as Nginx or HAProxy
• Implement IP-based access control lists (ACLs) to restrict login page access to authorized management networks only
• Deploy fail2ban or similar tools to automatically block IP addresses after excessive failed authentication attempts
• Use VPN or jump host architecture to limit direct network exposure of the IPP interface

# Example: Nginx rate-limiting configuration for IPP reverse proxy
limit_req_zone $binary_remote_addr zone=ipp_login:10m rate=5r/m;

location /login {
    limit_req zone=ipp_login burst=3 nodelay;
    limit_req_status 429;
    proxy_pass http://ipp-backend;
}