Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-8wm6-6fqh-phmc
Advisory ID github_osv/GHSA-8wm6-6fqh-phmc
Aliases CVE-2026-42253
Summary Apache ActiveMQ, Apache ActiveMQ Web have a Cross-site Scripting issue 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.
Status Published
Exploitability 0.5
Weighted Severity 5.5
Risk 2.8
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
cvssv3.1 6.1 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-8wm6-6fqh-phmc/GHSA-8wm6-6fqh-phmc.json
generic_textual MODERATE
Reference id Reference type URL
https://github.com/apache/activemq
http://www.openwall.com/lists/oss-security/2026/05/31/17
CVE-2026-42253 https://nvd.nist.gov/vuln/detail/CVE-2026-42253
j9vmlc410ht5f28fc98gx75jcbq62j00 Advisory https://lists.apache.org/thread/j9vmlc410ht5f28fc98gx75jcbq62j00
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-8wm6-6fqh-phmc/GHSA-8wm6-6fqh-phmc.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-06-01T13:12:19Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/42xxx/CVE-2026-42253.json

Source Advisory: vulnrichment/CVE-2026-42253

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]