What is CVE-2026-42253?

CVE-2026-42253 is a medium-severity vulnerability in Apache Activemq, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-01.

How severe is CVE-2026-42253?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Apache Activemq

CVE-2026-42253

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Apache ActiveMQ, Apache ActiveMQ Web. The MessageServlet in the ActiveMQ web console API copies every JMS message property into an HTTP…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (37.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Apache Activemq
Apache Activemq_web
Apache Software Foundation Activemq — versions 0, 6.0.0
Apache Software Foundation Activemq Web — versions 0, 6.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-42253?: CVE-2026-42253 is a medium-severity vulnerability in Apache Activemq, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-01.
How severe is CVE-2026-42253?: Medium severity. CVSS v3 base score is 6.1 out of 10.