Detect Ivanti Endpoint Manager (EPM) Authentication Bypass (CVE-2026-1603) in Google Chronicle
CVE-2026-1603 is an authentication bypass vulnerability (CWE-288) in Ivanti Endpoint Manager (EPM). This KEV-listed vulnerability allows unauthenticated attackers to bypass authentication mechanisms and gain unauthorized access to the EPM management interface. Successful exploitation may lead to full compromise of managed endpoints, lateral movement, and deployment of malicious software across the enterprise.
MITRE ATT&CK
YARA-L Detection Query
rule ivanti_epm_auth_bypass_cve_2026_1603 {
meta:
author = "df00tech Detection Engineering"
description = "Detects potential exploitation of CVE-2026-1603 Ivanti EPM authentication bypass"
severity = "CRITICAL"
priority = "HIGH"
reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-1603"
mitre_attack = "T1190, T1078, T1210"
events:
(
$auth.metadata.event_type = "USER_LOGIN"
and (
$auth.target.user.user_display_name = ""
or re.regex($auth.target.user.user_display_name, `(?i)anonymous|guest`)
)
and (
re.regex($auth.target.application, `(?i)landesk|ivanti|epm|ldms`)
or $auth.target.port in (9675, 9676)
)
)
or
(
$auth.metadata.event_type = "USER_LOGIN"
and $auth.metadata.product_name = "Ivanti EPM"
and $auth.security_result.action = "ALLOW"
and $auth.network.http.response_code != 0
)
condition:
$auth
}Chronicle YARA-L 2.0 rule detecting CVE-2026-1603 exploitation by identifying anonymous or empty user authentication successes targeting Ivanti EPM applications or known EPM ports, as well as unexpected authentication approvals from Ivanti EPM log sources.
Data Sources
Required Tables
False Positives & Tuning
- EPM service or system accounts with display names not populated in the UDM event
- Internal monitoring or health-check processes authenticating to EPM with reduced credential context
- Chronicle ingestion gaps or mapping issues causing user display names to appear empty
- Authorized red team testing within the Chronicle-monitored environment scope
Other platforms for CVE-2026-1603
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Simulate Anonymous Network Logon to EPM Port
Expected signal: Windows Security EventID 4624 with LogonType=3 and AccountName blank or 'ANONYMOUS LOGON' on the EPM server; IIS access log entry with 401/200 status for /ldlogon/ from test source IP; network flow record on EPM management port 9675.
- Test 2EPM Process Spawning Suspicious Child Process
Expected signal: DeviceProcessEvents entry showing cmd.exe spawned with working directory in Ivanti Management Suite path; process creation event with parent process in EPM directory; command line containing 'whoami' captured in endpoint telemetry.
- Test 3Authentication Bypass Simulation via Empty Credential HTTP Request
Expected signal: IIS access log entry on EPM server showing request to /ldlogon/ with empty Authorization header from test IP; network flow record; if EPM processes the request, a Windows Security EventID 4624 or 4648 with minimal credential context.
Unlock Pro Content
Get the full detection package for CVE-2026-1603 including response playbook, investigation guide, and atomic red team tests.