Home/CVE/Improper validation and restriction of a classpath path name vulnerability in Apache ActiveMQ Client, Apache ActiveMQ
CVE

CVE-2026-33227

Improper validation and restriction of a classpath path name vulnerability in Apache ActiveMQ Client, Apache ActiveMQ

Improper validation and restriction of a classpath path name vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ Web, Apache ActiveMQ. In two instances (when creating a Stomp consumer and also browsing messages in the Web console) an authenticated user provided "key" value could be constructed to traverse the classpath due to path concatenation. As a result, the application is exposed to a classpath path resource loading vulnerability that could potentially be chained together with another attack to lead to exploit. This issue affects Apache ActiveMQ Client: before 5.19.3, from 6.0.0 before 6.2.2.

Apache ActiveMQ Broker: before 5.19.3, from 6.0.0 before 6.2.2.

Apache ActiveMQ All: before 5.19.3, from 6.0.0 before 6.2.2.

Apache ActiveMQ Web: before 5.19.3, from 6.0.0 before 6.2.2.

Apache ActiveMQ: before 5.19.3, from 6.0.0 before 6.2.2. Users are recommended to upgrade to version 5.19.4 or 6.2.3, which fixes the issue. Note: 5.19.3 and 6.2.2 also fix this issue, but that is limited to non-Windows environments due to a path separator resolution bug fixed in 5.19.4 and 6.2.3.

MEDIUM · CVSS 4.3 EPSS 0.00077
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
▤

Affected Products & Versions

6
apache activemq< 5.19.3
apache activemq>= 6.0.0 and < 6.2.2
apache activemq broker< 5.19.3
apache activemq broker>= 6.0.0 and < 6.2.2
apache activemq web< 5.19.3
apache activemq web>= 6.0.0 and < 6.2.2
▤

Affected Packages

4
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.apache.activemq:activemq-all MODERATE fixed in 5.19.3
Maven org.apache.activemq:activemq-broker MODERATE fixed in 5.19.3
Maven org.apache.activemq:activemq-client MODERATE fixed in 5.19.3
Maven org.apache.activemq:activemq-web MODERATE fixed in 5.19.3
▣

Scoring & Timeline

4.3
MEDIUM · CVSS v3.1 · security@apache.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD07 Apr 2026 · 09:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://activemq.apache.org/security-advisories.data/CVE-2026-33227-announcement.txtVendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/06/4Mailing ListThird Party Advisory
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