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CVE-2026-42253

Affected software2 products, listed below
Severity6.1 Medium CVSS 3.1 2 scores
Fixed in5.19.7, 6.2.6
WeaknessCross-site scripting (CWE-79)
Published1 Jun 2026
Updated22 Jul 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 1.0% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory
Finding This CVE is MEDIUM severity, is not listed in CISA KEV or VulnCheck KEV, has no public exploit or PoC in any indexed source, carries no CISA Vulnrichment finding of a demonstrated exploit, and is not part of an Oracle Critical Patch Update. None of the signals that would put it in front of an engineer is present, and the volume of CVEs below that bar is too great to take one at a time, so no rule is written for it. This is a decision about what we act on, not a finding that the CVE is harmless — a patch may well be derivable, and a low-severity defect can still be one link in a longer chain.

CVSS

6.1 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 6.1 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N NVD Primary published
CVSS 3.1 6.1 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CISA-ADP Secondary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.activemq:apache-activemq 0 5.19.7 unbounded
org.apache.activemq:apache-activemq 6.0.0 6.2.6 unbounded
org.apache.activemq:activemq-web 0 5.19.7 unbounded
org.apache.activemq:activemq-web 6.0.0 6.2.6 unbounded

Products and versions

4 products, 8 version entries
SourceVendorProductSchemeAffected versions
nvd apache activemq generic < 5.19.7 · ≥ 6.0.0 and < 6.2.6
nvd apache activemq web generic < 5.19.7 · ≥ 6.0.0 and < 6.2.6
osv org.apache.activemq activemq-web generic < 5.19.7 · ≥ 6.0.0 and < 6.2.6
osv org.apache.activemq apache-activemq generic < 5.19.7 · ≥ 6.0.0 and < 6.2.6

References

URLTags
https://github.com/apache/activemq PACKAGE
https://lists.apache.org/thread/j9vmlc410ht5f28fc98gx75jcbq62j00 WEB
http://www.openwall.com/lists/oss-security/2026/05/31/17 WEB

Timeline

Published2026-06-01By the CVE Program.
NVD record modified2026-07-22NVD's own last-modified date for this record.