Detect Ivanti Endpoint Manager (EPM) Authentication Bypass (CVE-2026-1603) in Sumo Logic CSE
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
Sumo Detection Query
_sourceCategory=windows/security OR _sourceCategory=ivanti/epm OR _sourceCategory=network/flows
| parse "EventID=*" as event_id nodrop
| parse "LogonType=*" as logon_type nodrop
| parse "AccountName=*" as account_name nodrop
| parse "FailureReason=*" as failure_reason nodrop
| parse "ProcessName=*" as process_name nodrop
| parse "SourceAddress=*" as src_ip nodrop
| parse "DestPort=*" as dest_port nodrop
| where (
(event_id in ("4624", "4648") and logon_type = "3"
and (isNull(account_name) or account_name = "" or toLowerCase(account_name) in ("anonymous logon", "guest", "anonymous")))
or
(event_id = "4625" and toLowerCase(failure_reason) matches "*bypass*")
or
(toLowerCase(_sourceCategory) matches "*ivanti*" and toLowerCase(failure_reason) matches "*unauthenticated*")
)
| where (
toLowerCase(process_name) matches "*landesk*"
or toLowerCase(process_name) matches "*ivanti*"
or toLowerCase(process_name) matches "*epm*"
or dest_port in ("9675", "9676")
)
| eval risk = if(account_name = "" or toLowerCase(account_name) = "anonymous logon", "HIGH", "MEDIUM")
| count by src_ip, account_name, process_name, event_id, risk
| sort by _count descSumo Logic query detecting authentication bypass attempts against Ivanti EPM by correlating Windows Security events and Ivanti-specific log sources for anonymous or empty-credential logon successes to EPM processes and ports.
Data Sources
Required Tables
False Positives & Tuning
- EPM management service accounts operating under minimal credential contexts during routine operations
- Authorized vulnerability scanning tools exercising EPM authentication endpoints
- Lab environments with permissive authentication policies connected through shared Sumo Logic sources
- Log parsing gaps where account name fields are empty due to log format version differences
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.
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Get the full detection package for CVE-2026-1603 including response playbook, investigation guide, and atomic red team tests.