High severity · published Aug 11, 2026
CVE-2026-15554
Undertow-core: undertow: authentication bypass via ajp ssl_cert/is_ssl forgery
7.4
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 8.1.8.GA · Red Hat
All versions, or not specified · source: vendor
Affected product
RH
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15554
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-15554
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:53644
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:53645
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:53646
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:53806
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:70228
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:70229
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