Vulnerability record · CVE-2026-42253 · published 1 June 2026

CVE-2026-42253: Apache activemq cross-site scripting vulnerability

Apache · Activemq

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.

6.1 CVSS 3.1 Medium EPSS 1.0% · top 36.1% CWE-79 · Cross-site scripting

6.1CVSS 3.1 base score

1.0%EPSS exploitation probability, 30 days

NoNot in CISA KEV

2Affected product versions listed by NVD

2References

22 Jul 2026Last modified by NVD

Description

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Activemq Apache

Activemq Web Apache

References

Link	Tags
https://lists.apache.org/thread/j9vmlc410ht5f28fc98gx75jcbq62j00	Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/31/17	Mailing ListThird Party Advisory

Track CVE-2026-42253 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-46604Apache ActiveMQ OpenWire deserialization remote code executionThe Java OpenWire protocol marshaller in Apache ActiveMQ deserializes untrusted data, letting an attacker manipulate serialized class types so the br…KEVEPSS 100%analysed27 Oct 2023 9.8CVE-2016-3088Apache ActiveMQ Fileserver unrestricted file upload to RCEThe Fileserver web application in Apache ActiveMQ 5.x before 5.14.0 accepts HTTP PUT uploads and HTTP MOVE requests without adequate validation, lett…KEVEPSS 98%analysed1 Jun 2016 8.8CVE-2026-34197Apache ActiveMQ Jolokia JMX bridge code injection via broker config URIApache ActiveMQ Classic exposes the Jolokia JMX-HTTP bridge at /api/jolokia/ with a default policy that allows exec operations on all org.apache.acti…KEVEPSS 98%analysed7 Apr 2026 9.9CVE-2021-21345XStream deserialization allows remote command executionXStream before 1.4.16 deserializes untrusted XML without adequate type restrictions, allowing code injection and OS command execution. The flaw is a …EPSS 72%analysed23 Mar 2021 9.8CVE-2021-21347Netapp oncommand insight unrestricted file upload vulnerabilityXStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a re…EPSS 14%23 Mar 2021 9.8CVE-2021-21350Netapp oncommand insight unrestricted file upload vulnerabilityXStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a re…EPSS 15%23 Mar 2021 9.8CVE-2021-21346XStream deserialization allows remote code executionXStream before 1.4.16 deserializes untrusted XML without adequate type restrictions, letting a remote attacker load and execute arbitrary code by man…EPSS 76%analysed23 Mar 2021 9.8CVE-2021-21344XStream deserialization allows remote code executionXStream before 1.4.16 deserializes untrusted XML without adequate type restrictions, letting a remote attacker craft a stream that loads and executes…EPSS 76%analysed23 Mar 2021

Source: NIST National Vulnerability Database (record CVE-2026-42253), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.