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Description

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.

PUBLISHED Reserved 2026-04-25 | Published 2026-06-01 | Updated 2026-06-03 | Assigner apache

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status
unaffected

Any version before 5.19.7
affected

6.0.0 (semver) before 6.2.6
affected

Default status
unaffected

Any version before 5.19.7
affected

6.0.0 (semver) before 6.2.6
affected

Credits

Vishal Shukla finder

pyn3rd finder

uname finder

4ra1n finder

kikayli finder

References

www.openwall.com/lists/oss-security/2026/05/31/17

lists.apache.org/thread/j9vmlc410ht5f28fc98gx75jcbq62j00 vendor-advisory

cve.org (CVE-2026-42253)

nvd.nist.gov (CVE-2026-42253)

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