VulnerabilityPublished 4 Nov 2026

CVE-2026-108946: Apache ActiveMQ, Apache ActiveMQ KahaDB · Improper Input Validation Vulnerability

Affects activemq-brokerSource GCVE Database

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Authoritative record:CVE-2026-108946· High

Not known to be exploited : upgrade to 5.19.12 soon.

Data as of 4 Nov 2026, 16:28 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in 5.19.12

Exploitation evidence

Disclosed: evidence found.
CVE published 4 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-r4jx-783j-33mp

What to do

Upgrade org.apache.activemq/activemq-broker to 5.19.12.

Affected software

Product	Affected	Fixed in
Mavenorg.apache.activemq/activemq-broker`pkg:maven/org.apache.activemq/activemq-broker`Other threats	Affected <5.19.12	Fixed in 5.19.12

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade Apache ActiveMQ and Apache ActiveMQ KahaDB to versions 6.4.0, 6.3.3, or 5.19.12 or later, which contain fixes for this vulnerability. No other mitigation actions are indicated by the vendor advisory.

Description

An improper input validation vulnerability in Apache ActiveMQ and Apache ActiveMQ KahaDB allows authenticated clients to spoof other users' connection, session, and consumer IDs. This enables unauthorized consumption from another user's temporary queues or topics, disruption of live subscriptions by tearing them down, and permanent deletion of in-flight, unacknowledged messages via forged acknowledgments. The issue affects versions from 6.0.0 before 6.3.3 and before 5.19.12. Fixed versions are 6.4.0, 6.3.3, and 5.19.12.

Impact

An authenticated attacker can impersonate other users' connection and consumer IDs, enabling unauthorized consumption of messages from temporary queues or topics belonging to other users. The attacker can also disrupt active subscriptions by forcibly disconnecting victims and can cause permanent loss of in-flight, unacknowledged messages by forging acknowledgments. This compromises message confidentiality, availability, and integrity within the affected ActiveMQ deployments.

CWE-20Improper Input Validation (opens in a new tab)
Class weaknessLikelihood of exploit: HighCWE Top 25 (2025): #18OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design · Attack Surface Reduction
Consider using language-theoretic security (LangSec) techniques that characterize inputs using a formal language and build "recognizers" for that language. This effectively requires parsing to be a distinct layer that effectively enforces a boundary between raw input and internal data representations, instead of…
Architecture and Design · Libraries or Frameworks
Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter the product, including but not limited to: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any…
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
Injection Prevention (opens in a new tab)
SQL Injection Prevention (opens in a new tab)
Injection Prevention in Java (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Buffer Overflow via Environment Variables (opens in a new tab)
Server Side Include (SSI) Injection (opens in a new tab)
Cross Zone Scripting (opens in a new tab)
Command Line Execution through SQL Injection (opens in a new tab)
Object Relational Mapping Injection (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Nov 2026, 15:18 UTC

WeaknessesCWE-20

Technical details

References

Community reviews

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