CISA KEV High Input validation

CVE-2026-34197 — Apache ActiveMQ Improper Input Validation Vulnerability

Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ. Apache ActiveMQ Classic exposes the Jolokia JMX-HTTP bridge at /api/jolokia/ on the web console. The default Jolokia access policy permits exec operations on all ActiveMQ MBeans (org.apache.activemq:*), including BrokerService.addNetworkConnector(String) and BrokerService.addConnector(String). An authenticated attacker can invoke these operations with a crafted discovery URI that triggers the VM transport's brokerConfig parameter to load a remote Spring XML application context using ResourceXmlApplicationContext. Because Spring's ResourceXmlApplicationContext instantiates all singleton beans before the BrokerService validates the configuration, arbitrary code execution occurs on the broker's JVM through bean factory methods such as Runtime.exec(). This issue affects Apache ActiveMQ Broker: before 5.19.4, from 6.0.0 before 6.2.3; Apache ActiveMQ All: before 5.19.4, from 6.0.0 before 6.2.3; Apache ActiveMQ: before 5.19.4, from 6.0.0 before 6.2.3. Users are recommended to upgrade to version 5.19.4 or 6.2.3, which fixes the issue

Published Apr 7, 2026 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, CVE Program (cve.org) e CISA ADP, NIST National Vulnerability Database, GitHub Security Advisories · CNA: apache

Urgent

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · Apr 16, 2026 Detection templates (Nuclei) · 1 Metasploit modules · 1 Proofs of concept on GitHub · 15

How the score was calculated

Confirmed exploitation (CISA KEV)+35
Public exploit/PoC (nuclei, metasploit, github)+20
EPSS 15.5% (30-day exploitation probability)+15
Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Confirmed

CISA KEV, listed Apr 16, 2026

EPSS FIRST

15.49%

ahead of 97% of scored CVEs · Oct 14, 2026

Affects

Apache Software Foundation

Apache ActiveMQ and 4 more

CVSS base

8.8

High · 4 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Active

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Maven Org.apache.activemq:activemq-broker: fixed in version 5.19.5 — github.com (GitHub Security Advisories)
Maven Org.apache.activemq:activemq-broker: fixed in version 6.2.3 — github.com (GitHub Security Advisories)
Maven Org.apache.activemq:activemq-all: fixed in version 5.19.5 — github.com (GitHub Security Advisories)
Maven Org.apache.activemq:activemq-all: fixed in version 6.2.3 — github.com (GitHub Security Advisories)

CISA required action CISA

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

US federal deadline: Apr 30, 2026 — passed 168 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Apache Software Foundation Apache ActiveMQ, Apache Software Foundation Apache ActiveMQ All, Apache Software Foundation Apache ActiveMQ Broker…).
Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
Apply the fixed version or the patch documented under Remediation.
EPSS ahead of 97% of scored CVEs: prioritize it in the patch queue.
Search available logs for exploit probes matching the vulnerability class (input validation), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Apache Software Foundation	Apache ActiveMQ	< 5.19.4≥ 6.0.0 and < 6.2.3	Vulnerable	CVE Program (cve.org) e CISA ADP
Apache Software Foundation	Apache ActiveMQ	< 5.19.4≥ 6.0.0 and < 6.2.3	Vulnerable	NIST National Vulnerability Database
Apache Software Foundation	Apache ActiveMQ All	< 5.19.4≥ 6.0.0 and < 6.2.3	Vulnerable	CVE Program (cve.org) e CISA ADP
Apache Software Foundation	Apache ActiveMQ Broker	< 5.19.4≥ 6.0.0 and < 6.2.3	Vulnerable	CVE Program (cve.org) e CISA ADP
Apache Software Foundation	Apache ActiveMQ Broker	< 5.19.4≥ 6.0.0 and < 6.2.3	Vulnerable	NIST National Vulnerability Database
Maven	Org.apache.activemq:activemq-all	< 5.19.5≥ 6.0.0 and < 6.2.3	Vulnerable	GitHub Security Advisories
Maven	Org.apache.activemq:activemq-broker	< 5.19.5≥ 6.0.0 and < 6.2.3	Vulnerable	GitHub Security Advisories

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
8.8	CVSS 3.1	High	2.8	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
8.8	CVSS 3.1	High	2.8	5.9	0b0ca135-0b70-47e7-9f44-1890c2a1c46c via NIST National Vulnerability Database
8.8	CVSS 3.1	High	—	—	GitHub, Inc. via GitHub Security Advisories
8.8	CVSS 3.1	High	—	—	CISA-ADP via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: 134c704f-9b21-4f2e-91b3-4a467353bcc0)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-20 · Improper Input Validation

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed

Apr 16, 2026

Federal deadline

Apr 30, 2026

passed 168 day(s) ago

Ransomware use

Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Detection templates (Nuclei)

Apache ActiveMQ - Remote Code Execution

Metasploit modules

Apache ActiveMQ RCE via Jolokia addNetworkConnector excellent Apr 29, 2026

Proofs of concept on GitHub — 15 repositories; showing the 10 most starred

Apache ActiveMQ漏洞综合利用工具(CVE-2015-5254，CVE-2016-3088，CVE-2022-41678，CVE-2023-46604，CVE-2024-32114，CVE-2026-34197，CVE-2026-40466， CVE-2026-42588) ★ 85 Apr 20, 2026
Apache ActiveMQ Classic RCE research: CVE-2026-34197 / CVE-2026-42588 bypass chain + hardened-6.2.6 audit findings + Crowdfense comparison ★ 9 Jul 4, 2026
CVE-2026-34197 activemq PoC ★ 8 Apr 8, 2026
CVE-2026-34197 - Apache ActiveMQ RCE via Jolokia Endpoint PoC ★ 4 Apr 8, 2026
CVE-2026-34197 ★ 2 Apr 9, 2026
CVE-2026-34197 — Apache ActiveMQ RCE via Jolokia API | PoC Exploit ★ 2 Apr 9, 2026
CVE-2026-34197: Apache ActiveMQ Classic RCE via Jolokia API (CVSS 8.8). Python & Nmap NSE detection scripts. A 13-year-old vulnerability allows remote code execution through the addNetworkConnector MBean operation. Unauthenticated on versions 6.0.0 to 6.1.1. Fixed in 5.19.4 and 6.2.3. ★ 2 Apr 14, 2026
CVE-2026-34197 ★ 1 Apr 8, 2026
xshysjhq/CVE-2026-34197-payload-Apache-ActiveMQ- ★ 1 Apr 20, 2026
这是一个面向防守和内网排查的 Apache ActiveMQ Classic 暴露面检测工具，用于辅助评估 CVE-2026-34197 相关风险。 ★ 1 May 18, 2026

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

EPSS over time FIRST

Oct 12, 2026 → Oct 14, 2026 · 3 reading(s) · max 15.49%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Hunt retroactively in logs from before Apr 16, 2026 (KEV listing): exploitation may have started earlier.

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Fix documented
Oct 13, 2026 · GitHub Security Advisories
Affected products added · maven/org.apache.activemq:activemq-broker, maven/org.apache.activemq:activemq-all
Oct 13, 2026 · GitHub Security Advisories
Affected products added · apache/activemq, apache/activemq broker
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · Published → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record published
Oct 13, 2026
Affected products added · apache software foundation/apache activemq broker, apache software foundation/apache activemq all, apache software found
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
CVSS changed · 8.8
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Published
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Added to CISA KEV (detected)
Oct 13, 2026 · CISA Known Exploited Vulnerabilities
Record created in this database
Oct 13, 2026 · CISA Known Exploited Vulnerabilities
Added to CISA KEV catalog
Apr 15, 2026 · CISA
CVE published
Apr 7, 2026 · apache

Source activity

Repeated readings are counted rather than listed.

3× References added · Oct 13, 2026 – Oct 13, 2026
1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

8 on the record

activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txt
vendor-advisory, Vendor Advisory, CVE Program (cve.org) e CISA ADP
www.cisa.gov/known-exploited-vulnerabilities-catalog
US Government Resource, NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-34197
GitHub Security Advisories
www.openwall.com/lists/oss-security/2026/04/06/3
Mailing List, Third Party Advisory, NIST National Vulnerability Database
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34197.json
Third Party Advisory, NIST National Vulnerability Database
github.com/advisories/GHSA-rxpj-7qvf-xv32
GitHub Security Advisories
access.redhat.com/security/cve/CVE-2026-34197
Third Party Advisory, NIST National Vulnerability Database
bugzilla.redhat.com/show_bug.cgi
Third Party Advisory, NIST National Vulnerability Database

Elsewhere on this site

Apache Software Foundation
every CVE for this vendor

2026-04
what else CISA listed that month

Input validation
same class

CWE-20
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-52760 Apache ActiveMQ, Apache ActiveMQ Web Console: Stored XSS via Unescaped values in ActiveMQ Web Console Jun 30, 2026
High CVE-2026-53917 Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Client, Apache ActiveMQ Broker: Unbounded memory allocation in OpenWire property unmarshalling Jun 30, 2026
High CVE-2026-54475 Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Temporary destination ownership takeover Jun 30, 2026
High CVE-2026-53916 Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp: Unbounded header buffer in STOMP NIO codec Jun 30, 2026
High CVE-2026-49432 Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp: STOMP negative content-length enables denial of service Jun 30, 2026
High CVE-2026-50750 Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All: Pre-authentication OpenWire DoS following fix for CVE-2026-49270 Jun 30, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-34197 is "Apache ActiveMQ Improper Input Validation Vulnerability", rated High. It affects Apache ActiveMQ (Apache Software Foundation); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 8.8 describes technical severity. EPSS 15.49% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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