Answer in brief
CVE-2026-27446 records a Critical severity (CVSS 9.8) vulnerability in Apache Artemis, Apache ActiveMQ Artemis: Auth bypass for Core downstream federation. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache ActiveMQ Artemis (generic), Apache Software Foundation/Apache Artemis (generic), Siemens/Opcenter RDnL (generic), org.apache.activemq:artemis-server (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Apache Software Foundation/Apache ActiveMQ Artemis (generic), Apache Software Foundation/Apache Artemis (generic), Siemens/Opcenter RDnL (generic), org.apache.activemq:artemis-server (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:apache:artemis:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:apache:artemis:2.50.0:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Apache Software Foundation/Apache ActiveMQ Artemisgeneric | 2.11.0 | Not reported |
| Apache Software Foundation/Apache Artemisgeneric | 2.50.0 | Not reported |
| Siemens/Opcenter RDnLgeneric | >=0 <* | * |
| org.apache.activemq:artemis-servermaven | >=2.11.0 | Not reported |
| org.apache.artemis:artemis-servermaven | >=2.50.0 <2.52.0 | 2.52.0 |
Published upstream
Mar 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
Missing Authentication for Critical Function (CWE-306) vulnerability in Apache Artemis, Apache ActiveMQ Artemis. An unauthenticated remote attacker can use the Core protocol to force a target broker to establish an outbound Core federation connection to an attacker-controlled rogue broker. This could potentially result in message injection into any queue and/or message exfiltration from any queue via the rogue broker. This impacts environments that allow both: - incoming Core protocol connections from untrusted sources to the broker - outgoing Core protocol connections from the broker to untrusted targets This issue affects: - Apache Artemis from 2.50.0 through 2.51.0 - Apache ActiveMQ Artemis from 2.11.0 through 2.44.0. Users are recommended to upgrade to Apache Artemis version 2.52.0, which fixes the issue. The issue can be mitigated by one of the following: - Remove Core protocol support from any acceptor receiving connections from untrusted sources. Incoming Core protocol connections are supported by default via the "artemis" acceptor listening on port 61616. See the "protocols" URL parameter configured for the acceptor. An acceptor URL without this parameter supports all protocols by default, including Core. - Use two-way SSL (i.e. certificate-based authentication) in order to force every client to present the proper SSL certificate when establishing a connection before any message protocol handshake is attempted. This will prevent unauthenticated exploitation of this vulnerability. - Implement and deploy a Core interceptor to deny all Core downstream federation connect packets. Such packets have a type of (int) -16 or (byte) 0xfffffff0. Documentation for interceptors is available at https://artemis.apache.org/components/artemis/documentation/latest/intercepting-operations.html .
Quoted source text, attributed separately from HOL analysis.