CVE-2026-42253

mediumCVSS 6.1covered by 1 sourcefirst seen 2026-06-01

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.

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Exploitation outlook

Moderate exploitation risk1.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 62% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumGHSA-8wm6-6fqh-phmc: Apache ActiveMQ, Apache ActiveMQ Web have a Cross-site Scripting issueghsa · 2026-06-01

External references

NVD record for CVE-2026-42253

CVE.org record

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