Detect Apache ActiveMQ Improper Input Validation (CVE-2026-34197) in Sumo Logic CSE
Detects exploitation of CVE-2026-34197, an improper input validation vulnerability (CWE-20/CWE-94) in Apache ActiveMQ that has been added to the CISA Known Exploited Vulnerabilities catalog. Successful exploitation may allow remote attackers to execute arbitrary code or inject malicious content via crafted messages or broker connections. ActiveMQ's OpenWire protocol and web console are common attack surfaces for this class of vulnerability.
MITRE ATT&CK
- Tactic
- Initial Access Execution Persistence
Sumo Detection Query
_sourceCategory=*activemq* OR _sourceCategory=*network* OR _sourceCategory=*firewall* OR _sourceCategory=*endpoint*
| where !(src_ip matches "127.0.0.1" or src_ip matches "::1")
| where dest_port in ("61616", "61617", "8161", "8162", "5672", "1883", "61613") or src_port in ("61616", "61617", "8161", "8162", "5672", "1883", "61613")
| parse regex field=_raw "(?<suspicious_string>ClassPathXmlApplicationContext|classInfo|ExceptionResponse|cmd\.exe|powershell|/bin/sh|wget|curl|base64|ncat|\.\./)" nodrop
| where !isNull(suspicious_string) or !isEmpty(suspicious_string)
| timeslice 5m
| stats count as event_count, values(suspicious_string) as indicators, values(src_ip) as source_ips by _timeslice, dest_ip, dest_port, _sourceHost
| where event_count >= 1
| sort by _timeslice descSumo Logic query detecting CVE-2026-34197 exploitation activity by searching for known malicious string patterns within traffic destined for Apache ActiveMQ service ports across network and endpoint log sources.
Data Sources
Required Tables
False Positives & Tuning
- Spring Framework applications using ClassPathXmlApplicationContext in ActiveMQ message bodies as part of normal operations
- Authorized security testing or red team exercises against ActiveMQ infrastructure
- Network scanners performing port discovery that happen to probe ActiveMQ ports
Other platforms for CVE-2026-34197
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 1ActiveMQ OpenWire Port Probe with Malicious Payload Pattern
Expected signal: Network connection event to port 61616 from non-standard source; payload content containing 'ClassPathXmlApplicationContext' visible in network capture or IDS alerts
- Test 2Simulated Post-Exploitation Shell Spawn from Java Process
Expected signal: Sysmon Event ID 1 or Linux audit execve showing bash/sh spawned with parent process containing 'java' in the image path; process command line containing 'id', 'hostname', or 'whoami'
- Test 3ActiveMQ Web Console Access with Path Traversal Attempt
Expected signal: HTTP access log entries on port 8161 containing '../' path sequences and 'ClassPathXmlApplicationContext' in request body or destination parameter; network connection events to port 8161 from unexpected source
Unlock Pro Content
Get the full detection package for CVE-2026-34197 including response playbook, investigation guide, and atomic red team tests.