CVE-2026-42253 json
Apache ActiveMQ, Apache ActiveMQ Web: HTTP Response Header Injection via JMS Message Properties
published 5mo ago modified 2mo ago also BIT-activemq-2026-42253 , EUVD-2026-33578 , GHSA-8wm6-6fqh-phmc
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 63%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven org.apache.activemq:apache-activemq 5.19.7, 6.2.6
- maven org.apache.activemq:activemq-web 5.19.7, 6.2.6
- bitnami activemq 5.19.7, 6.2.6
- Apache Software Foundation Apache ActiveMQ 5.19.7, 6.2.6
- Apache Software Foundation Apache ActiveMQ Web 5.19.7, 6.2.6
Is CVE-2026-42253 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
1.02% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| OSV | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.apache.activemq:apache-activemq | <5.19.7 >=6.0.0, <6.2.6 |
5.19.7 6.2.6 |
| maven | org.apache.activemq:activemq-web | <5.19.7 >=6.0.0, <6.2.6 |
5.19.7 6.2.6 |
| bitnami | activemq | <5.19.7 >=6.0.0, <6.2.6 |
5.19.7 6.2.6 |
Affected products
- Apache Software Foundation Apache ActiveMQ
- Apache Software Foundation Apache ActiveMQ Web
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
lists.apache.org
/thread/j9vmlc410ht5f28fc98gx75jcbq62j00
vendor-advisory, web, mailing-list, advisory
-
openwall.com
/lists/oss-security/2026/05/31/17
web, mailing-list, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-42253
advisory, web
-
github.com
/apache/activemq
package
Sources
- CVE List CVE-2026-42253
- GitHub Advisory GHSA-8wm6-6fqh-phmc
- NVD CVE-2026-42253
- OSV BIT-activemq-2026-42253
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