High severity · published Aug 11, 2026
CVE-2026-15556
Picketlink-federation: picketlink saml 2.0 auth bypass via missing assertions
8.1
CVSS
0.3%
EPSS
No
On KEV
Description
A flaw was found in Picketlink's SP signature validation; a SAML response containing zero assertion elements matching the signature check can allow an attacker to forge a SAML response and auth as any principal with any roles on the protected application.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% 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 · Red Hat
All versions, or not specified · source: vendor
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
Affected product
RH
Red Hat JBoss Enterprise Application Platform 7
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15556
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-15556
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/security/cve/CVE-2026-15556
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2483121
More from Red Hat JBoss Enterprise Application Platform 7
9.8
CVE-2026-10579
Picketlink-federation: auth bypass in picketlink saml unsolicited-response
9.8
CVE-2026-49875
Apache CXF: XML External Entity (XXE) Injection in W3CMultiSchemaFactory and EndpointReferenceUtils
9.6
CVE-2025-12543
Undertow-core: undertow http server fails to reject malformed host headers leading to potential cache poisoning and ssrf
9.1
CVE-2026-28369
Undertow: undertow: request smuggling via malformed http request headers
9.1
CVE-2026-28367
Undertow: undertow: request smuggling via `\r\r\r` as a header block terminator