Critical severity · published Sep 10, 2026
CVE-2026-57967
Apache Artemis, Apache ActiveMQ Artemis: Missing authentication on CORE protocol session reattachment
9.8
CVSS
1.5%
EPSS
No
On KEV
Description
An unauthenticated remote attacker can craft a CORE protocol SESSION_REATTACH packet to steal an existing session and assume ongoing execution of the previously authenticated session.
This issue affects Apache Artemis: from 2.50.0 through 2.56.0; Apache ActiveMQ Artemis: from 1.0.0 through 2.44.0.
Users are recommended to upgrade to version 2.57.0, which fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AA
Apache ActiveMQ Artemis · Apache Software Foundation
1.0.0 through 2.44.0 · source: vendor
AA
Apache Artemis · Apache Software Foundation
2.50.0 through 2.56.0 · source: vendor
AR
Artemis · Apache
1.0.0 before 2.44.0; 2.50.0 before 2.57.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57967
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57967
vendor-advisory
https://lists.apache.org/thread/fxfjqrdsnksw5f17zs3yqo864lblgv6y
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