CVE-2026-42253

Name: CVE-2026-42253
Creator: NVD / NIST
Published: 2026-06-01T09:16:18.673+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.11%

Last modified Jun 17, 2026

CVE-2026-42253 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 1.11% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.11%

61.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Apache	Activemq	< 5.19.7
Apache	Activemq	>= 6.0.0, < 6.2.6
Apache	Activemq Web	< 5.19.7
Apache	Activemq Web	>= 6.0.0, < 6.2.6

References

https://lists.apache.org/thread/j9vmlc410ht5f28fc98gx75jcbq62j00Mailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/31/17Mailing List, Third Party Advisory

Timeline

Published: Jun 1, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-42253?

How severe is CVE-2026-42253?

CVE-2026-42253 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.11% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42253?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42253?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST