CVE-2026-1603: Ivanti Endpoint Manager Auth Bypass Flaw

CVE-2026-1603 Overview

CVE-2026-1603 is an authentication bypass vulnerability affecting Ivanti Endpoint Manager (EPM) that allows a remote unauthenticated attacker to leak specific stored credential data. This vulnerability stems from improper authentication mechanisms (CWE-288: Authentication Bypass Using an Alternate Path or Channel), enabling attackers to circumvent normal authentication controls and access sensitive credential information without proper authorization.

Organizations using affected versions of Ivanti Endpoint Manager are at risk of credential exposure, which could lead to further compromise of managed endpoints and lateral movement within the network.

Critical Impact

Remote unauthenticated attackers can bypass authentication controls to extract stored credentials from Ivanti Endpoint Manager, potentially compromising the security of all managed endpoints in the enterprise environment.

Affected Products

• Ivanti Endpoint Manager versions prior to 2024
• Ivanti Endpoint Manager 2024 (base release through SU4 SR1)
• Ivanti Endpoint Manager 2024 SU1, SU2, SU3, SU3 Security Release 1, SU4, and SU4 SR1

Discovery Timeline

• 2026-02-10 - CVE-2026-1603 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2026-1603

Vulnerability Analysis

This authentication bypass vulnerability allows remote attackers to access protected resources without valid credentials. The flaw exists in the authentication mechanism of Ivanti Endpoint Manager, where certain API endpoints or administrative functions can be accessed through an alternate path that does not properly enforce authentication requirements.

The vulnerability has a network-based attack vector with low complexity, requiring no privileges or user interaction. The primary impact is to confidentiality, as successful exploitation results in the disclosure of stored credential data. This type of vulnerability is particularly concerning in endpoint management solutions, as they typically store credentials used to manage and deploy software across numerous enterprise systems.

Root Cause

The root cause is an authentication bypass via an alternate path or channel (CWE-288). This occurs when the application provides an alternative authentication mechanism or pathway that does not properly validate user identity, allowing attackers to access protected functionality without presenting valid credentials.

In the context of Ivanti Endpoint Manager, certain requests or API calls may not be subject to the same authentication controls as the primary interface, creating a gap that attackers can exploit to retrieve sensitive credential information stored within the system.

Attack Vector

The attack can be executed remotely over the network by an unauthenticated attacker. The exploitation process involves:

1. Identifying accessible endpoints in Ivanti Endpoint Manager that bypass standard authentication
2. Crafting requests that leverage the alternate authentication path
3. Extracting stored credential data from the vulnerable endpoint
4. Using the compromised credentials for further attacks against managed systems

The vulnerability requires no privileges, no user interaction, and has low attack complexity, making it relatively straightforward to exploit. While no public exploits are currently available, the simplicity of the attack vector increases the likelihood of exploitation attempts.

Detection Methods for CVE-2026-1603

Indicators of Compromise

• Unexpected or anomalous API requests to Ivanti EPM server from unknown or external IP addresses
• Authentication logs showing access to protected resources without corresponding successful authentication events
• Unusual data exfiltration patterns from the EPM server, particularly involving credential stores
• Access attempts to administrative endpoints from non-administrative network segments

Detection Strategies

• Monitor Ivanti EPM server logs for unauthenticated access attempts to credential-related endpoints
• Implement network-level monitoring to detect unusual traffic patterns targeting the EPM management interface
• Deploy intrusion detection signatures to identify exploitation attempts against known vulnerable endpoints
• Review access logs for requests that bypass the standard authentication flow

Monitoring Recommendations

• Enable verbose logging on Ivanti Endpoint Manager servers to capture detailed request information
• Configure SIEM alerts for authentication anomalies related to EPM administrative functions
• Monitor for credential usage from unexpected locations that may indicate compromised credentials
• Implement network segmentation monitoring to detect lateral movement attempts using leaked credentials

How to Mitigate CVE-2026-1603

Immediate Actions Required

• Upgrade Ivanti Endpoint Manager to version 2024 SU5 or later immediately
• Restrict network access to Ivanti EPM servers to authorized administrative networks only
• Rotate all credentials stored within Ivanti Endpoint Manager as a precautionary measure
• Review access logs for signs of prior exploitation attempts

Patch Information

Ivanti has released a security update that addresses this vulnerability. Organizations should upgrade to Ivanti Endpoint Manager 2024 SU5 or later to remediate this issue. The security advisory with detailed patch information is available from Ivanti Security Advisory February 2026.

Workarounds

• Implement strict network access controls to limit connectivity to the EPM server from trusted networks only
• Deploy a web application firewall (WAF) in front of the EPM server to filter potentially malicious requests
• Enable enhanced monitoring and alerting for any access to the EPM management interface
• Consider temporarily disabling external access to the EPM server until patching is complete

# Example firewall rule to restrict EPM access (Linux iptables)
# Allow EPM access only from trusted admin network 10.10.0.0/24
iptables -A INPUT -p tcp --dport 443 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP