Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-29T20:44:39 tomcat: Apache Tomcat: Replay attack via improper authentication in EncryptionInterceptor 4.2 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N CWE-294

Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue.

A flaw was found in Apache Tomcat. An improper authentication vulnerability in the EncryptionInterceptor component allows a remote attacker to perform a replay attack. This could lead to unauthorized access or manipulation of data within the cluster component.

A flaw was found in Apache Tomcat's EncryptionInterceptor used for Tribes cluster communication. An improper authentication vulnerability allows a replay attack against encrypted cluster messages. Exploitation requires the EncryptionInterceptor to be configured for Tomcat clustering, which is a non-default configuration, and the attacker must have access to the cluster network to capture and replay messages. Apache rates this vulnerability as Low severity. Red Hat has corrected the impact from IMPORTANT to MODERATE — the original AI-Bot CVSS of 8.2 (AV:N/AC:L) incorrectly scored this as internet-facing with low complexity, when Tribes cluster traffic is adjacent-network (AV:A) and requires non-default clustering configuration (AC:H). The corrected vector is CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N (4.2). This vulnerability only affects Tomcat deployments using the EncryptionInterceptor for Tribes cluster communication. Deployments that do not use Tomcat clustering or do not configure the EncryptionInterceptor are not affected. Ensure cluster communication channels are restricted to trusted, isolated networks. Red Hat Hardened Images 2026-06-24T00:00:00Z RHSA-2026:29203 tomcat10-main-10.1.56-1.hum1 Red Hat Hardened Images 2026-06-29T00:00:00Z RHSA-2026:32960 tomcat11-main-11.0.23-0.1.hum1 Red Hat Enterprise Linux 10 Fix deferred tomcat Red Hat Enterprise Linux 10 Fix deferred tomcat9 Red Hat Enterprise Linux 6 Fix deferred tomcat6 Red Hat Enterprise Linux 7 Fix deferred tomcat Red Hat Enterprise Linux 8 Fix deferred pki-deps:10.6/pki-servlet-engine Red Hat Enterprise Linux 8 Fix deferred tomcat Red Hat Enterprise Linux 9 Fix deferred pki-servlet-engine Red Hat Enterprise Linux 9 Fix deferred tomcat Red Hat JBoss Web Server 5 Fix deferred jws5-tomcat Red Hat JBoss Web Server 6 Not affected tomcat-catalina Red Hat JBoss Web Server 7 Not affected tomcat-catalina https://www.cve.org/CVERecord?id=CVE-2026-55955 https://nvd.nist.gov/vuln/detail/CVE-2026-55955 https://lists.apache.org/thread/g4p5sf45p3f9r011pwqs9r54yd64s106