VulnerabilityPublished 24 Apr 2026

CVE-2026-41043: Apache ActiveMQ · Cross-site Scripting

Affects Apache ActiveMQSource CVE Database V5

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Not known to be exploited · CVSS 6.5 Medium : upgrade to 6.2.5 or 5.19.6 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

6.5Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 6.2.5, 5.19.6

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Apr 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 30 Oct 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.

What to do

Upgrade Apache ActiveMQ and Apache ActiveMQ Web and org.apache.activemq/activemq and Apache Software Foundation/org.apache.activemq:apache-activemq and Apache Software Foundation/org.apache.activemq:activemq-web to 6.2.5 or 5.19.6.

Affected software

Product	Affected	Fixed in
Apache Software FoundationApache ActiveMQ	Affected >=6.0.0 <6.2.5	Fixed in 6.2.5
Apache Software FoundationApache ActiveMQ	Affected <5.19.6	Fixed in 5.19.6
Apache Software FoundationApache ActiveMQ Web	Affected >=6.0.0 <6.2.5	Fixed in 6.2.5
Apache Software FoundationApache ActiveMQ Web	Affected <5.19.6	Fixed in 5.19.6
Mavenorg.apache.activemq/activemq`pkg:maven/org.apache.activemq/activemq`Other threats	Affected <5.19.6 >=6.0.0 <6.2.5 =6.0.0	Fixed in 5.19.6 6.2.5
MavenApache Software Foundation/org.apache.activemq:apache-activemq`pkg:maven/Apache Software Foundation/org.apache.activemq:apache-activemq`Other threats	Affected <5.19.6 >=6.0.0 <6.2.5	Fixed in 5.19.6 6.2.5

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 to version 5.19.6 or 6.2.5 or later, where this vulnerability has been fixed. Patch status is confirmed by the vendor's recommendation to upgrade to these versions. No other mitigations or temporary fixes are indicated.

Description

CVE-2026-41043 is a medium severity cross-site scripting (XSS) vulnerability in Apache ActiveMQ and its web console. An authenticated attacker can inject malicious HTML content by overriding the content type and injecting HTML into a JMS selector field when browsing queues. This vulnerability affects Apache ActiveMQ versions before 5.19.6 and from 6.0.0 before 6.2.5. The issue allows limited impact on confidentiality and integrity but does not affect availability.

Impact

Successful exploitation allows an authenticated attacker to inject malicious HTML content in the web console interface, potentially leading to limited confidentiality and integrity impacts such as session hijacking or content manipulation. There is no impact on availability. The attack requires authentication and can be performed remotely over the network.

Summary

This vulnerability involves improper neutralization of script-related HTML tags in the Apache ActiveMQ web console. Specifically, an authenticated user can manipulate the content type to HTML instead of XML and inject HTML into a JMS selector field, resulting in reflected XSS. The vulnerability affects Apache ActiveMQ versions prior to 5.19.6 and from 6.0.0 up to but not including 6.2.5. The CVSS 3.1 base score is 6.5 (medium), reflecting network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, and limited confidentiality and integrity impact. The vendor recommends upgrading to fixed versions 5.19.6 or 6.2.5 to remediate this issue.

CWE-79Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: 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 external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes (opens in a new tab)
Base weaknessOWASP Top 10 A08:2025: Software or Data Integrity Failures (opens in a new tab)
The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.
Implementation
If available, use features of the language or framework that allow specification of allowlists of attributes or fields that are allowed to be modified. If possible, prefer allowlists over denylists.
Architecture and Design · Implementation
If available, use the signing/sealing features of the programming language to assure that deserialized data has not been tainted. For example, a hash-based message authentication code (HMAC) could be used to ensure that data has not been modified.
Implementation · Input Validation
For any externally-influenced input, check the input against an allowlist of internal object attributes or fields that are allowed to be modified.
OWASP Cheat Sheets
Mass Assignment (opens in a new tab)
Software Supply Chain Security (opens in a new tab)
Infrastructure as Code (opens in a new tab)
OWASP ASVS 4.0.3
V5.1.2 (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 1 May 2026, 20:43 UTC

WeaknessesCWE-79, CWE-915

Technical details

References

Community reviews

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