CVE-2026-27446

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 64% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 11%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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 .

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
95.3%
KEV
Not listed

Published

March 4, 2026

Last Modified

June 30, 2026

Advisory Details (11)

Auto-updated Jul 12, 2026
Patch available. Sources: redhat.
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-27446
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:3957
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:3955
redhat Patch Available

Affected: Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common

https://access.redhat.com/errata/RHSA-2026:18059
redhat Patch Available

Affected: Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common

https://access.redhat.com/errata/RHSA-2026:18055
redhat Patch Available

Affected: Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common

https://access.redhat.com/errata/RHSA-2026:18054
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:17668
generic

oss-security - Re: CVE-2026-27446: Apache Artemis, Apache ActiveMQ Artemis: Auth bypass for Core downstream federation

http://www.openwall.com/lists/oss-security/2026/03/04/1
generic

oss-security - CVE-2026-27446: Apache Artemis, Apache ActiveMQ Artemis: Auth bypass for Core downstream federation

http://www.openwall.com/lists/oss-security/2026/03/03/4
generic
https://lists.apache.org/thread/jwpsdc8tdxotm98od8n8n30fqlzoc8gg
generic

SSA-085541

https://cert-portal.siemens.com/productcert/html/ssa-085541.html

Vendor Advisories for CVE-2026-27446(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhateap8-activemq-artemis-0:2.40.0-6.redhat_00012.1.el9eap2026-05-18redhat
redhatartemis-server2026-05-18redhat
redhateap8-activemq-artemis-0:2.40.0-6.redhat_00012.1.el8eap2026-05-18redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 1 ecosystem)
Maven(2)
PackageVulnerable rangeFixed inDependents
org.apache.activemq:artemis-server2.11.0 ... 2.44.0 (39 versions)——
org.apache.artemis:artemis-server2.50.0, 2.51.02.52.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 133 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
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  15. 2026-06-29 15:02 UTCOSV refresh
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  1. 2026-06-23 21:32 UTCEPSS rescore
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  15. 2026-06-12 04:57 UTCEG score recompute
  16. 2026-06-12 04:57 UTCVendor advisory
  17. 2026-06-12 01:18 UTCEG score recompute
  18. 2026-06-12 01:18 UTCVendor advisory
  19. 2026-06-11 14:00 UTCEPSS rescore
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  21. 2026-06-10 22:50 UTCVendor advisory
  22. 2026-06-10 22:18 UTCEPSS rescore
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  24. 2026-06-10 19:07 UTCEG score recompute
  25. 2026-06-10 19:07 UTCVendor advisory
  26. 2026-06-10 13:22 UTCEPSS rescore
  27. 2026-06-10 08:38 UTCEG score recompute
  28. 2026-06-10 08:38 UTCVendor advisory
  29. 2026-06-10 01:58 UTCEG score recompute
  30. 2026-06-10 01:58 UTCVendor advisory
  31. 2026-06-09 18:04 UTCEG score recompute
  32. 2026-06-09 18:04 UTCVendor advisory
  33. 2026-06-08 14:17 UTCEPSS rescore
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  35. 2026-06-08 08:43 UTCEG score recompute
  36. 2026-06-08 08:43 UTCVendor advisory
  37. 2026-06-08 05:04 UTCEG score recompute
  38. 2026-06-08 05:04 UTCVendor advisory
  39. 2026-06-08 01:19 UTCEG score recompute
  40. 2026-06-08 01:19 UTCVendor advisory
  41. 2026-06-07 19:52 UTCEG score recompute
  42. 2026-06-07 19:52 UTCVendor advisory
  43. 2026-06-07 16:13 UTCEG score recompute
  44. 2026-06-07 16:13 UTCVendor advisory
  45. 2026-06-07 15:25 UTCEPSS rescore
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  75. 2026-05-26 07:18 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-27446?
CVE-2026-27446 is a critical vulnerability published on March 4, 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…
When was CVE-2026-27446 disclosed?
CVE-2026-27446 was first published in the National Vulnerability Database on March 4, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27446 actively exploited?
CVE-2026-27446 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-27446?
CVE-2026-27446 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-27446?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27446, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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