PT-2026-45369 · Apache · Apache Activemq+3

4Ra1N + 3 · Published 2026-06-01 · Updated 2026-06-02 · CVE-2026-42253

Mitre

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-42253

Affected Products

Apache Activemq

Apache Activemq Web

Activemq

Activemq Web

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-42253 · Security Note
• https://lists.apache.org/thread/j9vmlc410ht5f28fc98gx75jcbq62j00 · Vendor Advisory
• https://twitter.com/pyn3rd/status/2061481639998632285 · Twitter Post
• http://openwall.com/lists/oss-security/2026/05/31/17 · Note
• https://twitter.com/vuln_tracker/status/2061621563980759486 · Twitter Post