CVE-2026-33227

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

The following products are affected by CVE-2026-33227 vulnerability.

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Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33227.

URL	Resource
http://www.openwall.com/lists/oss-security/2026/04/06/4
https://activemq.apache.org/security-advisories.data/CVE-2026-33227-announcement.txt
https://nvd.nist.gov/vuln/detail/CVE-2026-33227
https://www.cve.org/CVERecord?id=CVE-2026-33227