CVE-2026-15554

Undertow-core: undertow: authentication bypass via ajp ssl_cert/is_ssl forgery

Published Aug 11, 2026 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Workaround

Restrict direct TCP access to the Undertow AJP listener (default port 8009) so that only trusted reverse proxies can connect, for example by binding the AJP listener to localhost or applying firewall rules that limit access to the port to trusted hosts, since exploitation requires direct network access to the AJP port. Additionally, configure the AJP listener to require a shared secret so that AJP requests without proper authentication are rejected, as the flaw arises because forged ssl_cert and is_ssl attributes are honoured without any shared-secret authentication.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:/a:redhat:jboss_enterprise_application_platform:7
cpe:/a:redhat:jboss_enterprise_application_platform:8.1
Type Values Removed Values Added
CPEs cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el8
cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el9
Type Values Removed Values Added
CPEs cpe:/a:redhat:jboss_enterprise_application_platform:7
Type Values Removed Values Added
CPEs cpe:/a:redhat:jboss_enterprise_application_platform:7
cpe:/a:redhat:jboss_enterprise_application_platform:7.4
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:jboss_enterprise_application_platform:8 cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el9
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:jboss_enterprise_application_platform:7
cpe:/a:redhat:jboss_enterprise_application_platform:7.4::el7
cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el8
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:jboss_enterprise_application_platform:7
Type Values Removed Values Added
CPEs cpe:/a:redhat:jboss_enterprise_application_platform:7 cpe:/a:redhat:jboss_enterprise_application_platform:7.4::el7
References
Type Values Removed Values Added
First Time appeared Redhat jboss Enterprise Application Platform Els
CPEs cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7
Vendors & Products Redhat jboss Enterprise Application Platform Els
References
Type Values Removed Values Added
First Time appeared Redhat jboss Enterprise Application Platform Expansion Pack
Vendors & Products Redhat jboss Enterprise Application Platform Expansion Pack
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Undertow-core: undertow: authentication bypass via ajp ssl_cert/is_ssl forgery
First Time appeared Redhat
Redhat jboss Enterprise Application Platform
Redhat jbosseapxp
Weaknesses CWE-295
CPEs cpe:/a:redhat:jboss_enterprise_application_platform:7
cpe:/a:redhat:jboss_enterprise_application_platform:8
cpe:/a:redhat:jbosseapxp
Vendors & Products Redhat
Redhat jboss Enterprise Application Platform
Redhat jbosseapxp
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 12, 2026, 2:08 PM
Reserved
Jul 13, 2026, 4:54 AM
Status
Awaiting Analysis
Published
Aug 11, 2026, 9:17 AM
Modified
Nov 12, 2026, 2:17 PM
Severity
Important
Public date
Aug 11, 2026, 5:49 AM