High [CVE-2026-15554] Authentication Bypass via AJP ssl_cert/is_ssl Forgery
This high-severity Red Hat Linux advisory covers CVE-2026-15554 affecting Red Hat JBoss Enterprise Application Platform 7.4.25, Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7, Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8.
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Summary
the Undertow AJP listener honours forged ssl_cert and is_ssl AJP attributes without requiring any shared-secret authentication. This enables an unauthenticated attacker with direct TCP access to port 8009 to bypass CLIENT-CERT authentication by injecting a forged X.509 certificate via the AJP protocol.
Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-295.
Affected Red Hat products: Red Hat JBoss Enterprise Application Platform 7.4.25; Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7; Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8; Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9; Red Hat JBoss Enterprise Application Platform 7.
Red Hat lists Red Hat JBoss Enterprise Application Platform Expansion Pack as not affected. Red Hat fixing advisory: RHSA-2026:53806, RHSA-2026:53644, RHSA-2026:53645, RHSA-2026:53646, RHSA-2026:70230, RHSA-2026:70228, RHSA-2026:70229.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 15 hours ago·verify at source
- io.undertow/undertow-core:2.2.40.SP3-redhat-00001
- eap7-activemq-artemis-0:2.16.0-22.redhat_00057.1.el7eap
- eap7-glassfish-jsf-0:2.3.14-11.SP11_redhat_00001.1.el7eap
- eap7-ironjacamar-0:1.5.26-2.Final_redhat_00001.1.el7eap
- eap7-jackson-annotations-0:2.18.8-1.redhat_00003.1.el7eap
- eap7-jackson-core-0:2.18.8-1.redhat_00003.1.el7eap
- eap7-jackson-databind-0:2.18.8-1.redhat_00003.1.el7eap
- eap7-jackson-jaxrs-providers-0:2.18.8-1.redhat_00003.1.el7eap
- eap7-jackson-modules-base-0:2.18.8-1.redhat_00003.1.el7eap
- eap7-jackson-modules-java8-0:2.18.8-1.redhat_00003.1.el7eap
- eap7-jboss-remoting-0:5.0.31-3.SP2_redhat_00001.1.el7eap
- eap7-jboss-server-migration-0:1.10.0-46.Final_redhat_00044.1.el7eap
- eap7-netty-0:4.1.135-1.Final_redhat_00001.1.el7eap
- eap7-netty-transport-native-epoll-0:4.1.135-1.Final_redhat_00001.1.el7eap
- eap7-picketlink-bindings-0:2.5.5-30.SP12_redhat_00020.1.el7eap
- eap7-picketlink-federation-0:2.5.5-24.SP12_redhat_00016.1.el7eap
- eap7-undertow-0:2.2.40-2.SP3_redhat_00001.1.el7eap
- eap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el7eap
- eap7-activemq-artemis-0:2.16.0-22.redhat_00057.1.el8eap
- eap7-glassfish-jsf-0:2.3.14-11.SP11_redhat_00001.1.el8eap
- eap7-ironjacamar-0:1.5.26-2.Final_redhat_00001.1.el8eap
- eap7-jackson-annotations-0:2.18.8-1.redhat_00003.1.el8eap
- eap7-jackson-core-0:2.18.8-1.redhat_00003.1.el8eap
- eap7-jackson-databind-0:2.18.8-1.redhat_00003.1.el8eap
- eap7-jackson-jaxrs-providers-0:2.18.8-1.redhat_00003.1.el8eap
- eap7-jackson-modules-base-0:2.18.8-1.redhat_00003.1.el8eap
- eap7-jackson-modules-java8-0:2.18.8-1.redhat_00003.1.el8eap
- eap7-jboss-remoting-0:5.0.31-3.SP2_redhat_00001.1.el8eap
- eap7-jboss-server-migration-0:1.10.0-46.Final_redhat_00044.1.el8eap
- eap7-netty-0:4.1.135-1.Final_redhat_00001.1.el8eap
- eap7-netty-transport-native-epoll-0:4.1.135-1.Final_redhat_00001.1.el8eap
- eap7-picketlink-bindings-0:2.5.5-30.SP12_redhat_00020.1.el8eap
- eap7-picketlink-federation-0:2.5.5-24.SP12_redhat_00016.1.el8eap
- eap7-undertow-0:2.2.40-1.SP3_redhat_00001.1.el8eap
- eap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el8eap
- eap7-activemq-artemis-0:2.16.0-22.redhat_00057.1.el9eap
- eap7-glassfish-jsf-0:2.3.14-11.SP11_redhat_00001.1.el9eap
- eap7-ironjacamar-0:1.5.26-2.Final_redhat_00001.1.el9eap
- eap7-jackson-annotations-0:2.18.8-1.redhat_00003.1.el9eap
- eap7-jackson-core-0:2.18.8-1.redhat_00003.1.el9eap
- RHSA-2026:53806
- RHSA-2026:53644
- RHSA-2026:53645
- RHSA-2026:53646
- RHSA-2026:70230
- RHSA-2026:70228
- RHSA-2026:70229
Official advisory · high-confidence parse· fetched 15 hours ago·verify at source
Mitigation
Upgrade to a fixed release: io.undertow/undertow-core:2.2.40.SP3-redhat-00001, eap7-activemq-artemis-0:2.16.0-22.redhat_00057.1.el7eap, eap7-glassfish-jsf-0:2.3.14-11.SP11_redhat_00001.1.el7eap, eap7-ironjacamar-0:1.5.26-2.Final_redhat_00001.1.el7eap, eap7-jackson-annotations-0:2.18.8-1.redhat_00003.1.el7eap, eap7-jackson-core-0:2.18.8-1.redhat_00003.1.el7eap. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 15 hours ago·verify at source
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