CVE-2026-33227 — MEDIUM (4.3)

Q: How severe is CVE-2026-33227?

CVE-2026-33227 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-33227?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Activemq, Apache Activemq Broker, Apache Activemq Web.

Vulnerability Description

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.

CVSS Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Apache	Activemq	< 5.19.3
Apache	Activemq Broker	< 5.19.3
Apache	Activemq Web	< 5.19.3

Related Weaknesses (CWE)

CWE-22

References

https://activemq.apache.org/security-advisories.data/CVE-2026-33227-announcementVendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/06/4Mailing ListThird Party Advisory

FAQ

What is CVE-2026-33227?

CVE-2026-33227 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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 in...

How severe is CVE-2026-33227?

CVE-2026-33227 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33227?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Activemq, Apache Activemq Broker, Apache Activemq Web.