Full Report
CISA warned that attackers are now exploiting a high-severity Apache ActiveMQ vulnerability, which was patched earlier this month after going undetected for 13 years. [...]
Analysis Summary
# Vulnerability: Apache ActiveMQ Improper Input Validation (RCE)
## CVE Details
- CVE ID: CVE-2026-34197
- CVSS Score: High Severity (Specific numerical score pending NVD finalization)
- CWE: Improper Input Validation (Leading to Injection)
## Affected Systems
- Products: Apache ActiveMQ Classic
- Versions:
- Versions prior to 6.2.3
- Versions prior to 5.19.4
- Configurations: Authenticated access to the message broker.
## Vulnerability Description
This flaw is an improper input validation vulnerability that existed undetected in the codebase for 13 years. Discovered via AI-assisted research, the flaw allows an authenticated attacker to perform a remote code execution (RCE) attack. By injecting malicious parameters into the broker configuration, an attacker can force the application to execute arbitrary code.
## Exploitation
- Status: Exploited in the wild (Added to CISA KEV Catalog)
- Complexity: Low (Methods for ActiveMQ exploitation are well-documented)
- Attack Vector: Network
## Impact
- Confidentiality: High (Full access to system data)
- Integrity: High (Arbitrary code execution and system modification)
- Availability: High (Potential for system takeover or service disruption)
## Remediation
### Patches
The Apache Software Foundation has released the following versions to address this flaw:
- Apache ActiveMQ Classic 6.2.3
- Apache ActiveMQ Classic 5.19.4
### Workarounds
- No specific software workarounds were provided in the article; however, CISA recommends discontinuing use of the product if patches cannot be applied.
- Restrict network access to the ActiveMQ management interface and broker ports to trusted IPs only.
## Detection
- **Indicators of Compromise (IoC):** Look for suspicious broker connections in the ActiveMQ logs.
- **Specific Query Parameter:** Monitor for the use of the `brokerConfig=xbean:http://` query parameter.
- **Protocol Analysis:** Inspect logs for unusual usage of the internal transport protocol `VM` in conjunction with external HTTP requests.
- **Public Exposure:** Over 7,500 instances are currently tracked as exposed online; administrators should verify if their instances are reachable via services like Shadowserver.
## References
- [Vendor Advisory] hxxp://activemq[.]apache[.]org/security-advisories.data/CVE-2026-34197-announcement[.]txt
- [CISA KEV Catalog] hxxps://www[.]cisa[.]gov/known-exploited-vulnerabilities-catalog
- [Researcher Analysis] hxxps://horizon3[.]ai/attack-research/disclosures/cve-2026-34197-activemq-rce-jolokia/
- [NVD Detail] hxxp://nvd[.]nist[.]gov/vuln/detail/CVE-2026-34197