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GHSA-8wm6-6fqh-phmc: Apache ActiveMQ, Apache ActiveMQ Web have a Cross-site Scripting issue

mediumCVSS 6.1CVE-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 response header without any validation. This can allow overwriting and injecting security headers by setting them on JMS messages that are returned by the servlet. This issue affects Apache ActiveMQ: before 5.19.7, from 6.0.0 before 6.2.6; Apache ActiveMQ Web: before 5.19.7, from 6.0.0 before 6.2.6. Users are recommended to upgrade to version 5.19.7 or 6.2.6, which fixes the issue. The MessageServlet has now been deprecated and disabled by default.

Details

Source
GitHub Security Advisories (INTL · database · site)
Severity
medium — CVSS 6.1
Published
2026-06-01
Last updated
2026-07-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://github.com/advisories/GHSA-8wm6-6fqh-phmc

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-42253coverage & exploitation statusNVD · CVE.org

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