---
id: CVE-2026-15556
title: >-
  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 prot…
summary: >-
  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 prot…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-347
vendor: Red Hat
product: org.picketlink/picketlink-federation
affected:
  - org.picketlink/picketlink-federation (all versions)
  - eap7-activemq-artemis (all versions)
  - eap7-glassfish-jsf (all versions)
  - eap7-ironjacamar (all versions)
  - eap7-jackson-annotations (all versions)
  - eap7-jackson-core (all versions)
  - eap7-jackson-databind (all versions)
  - eap7-jackson-jaxrs-providers (all versions)
  - eap7-jackson-modules-base (all versions)
  - eap7-jackson-modules-java8 (all versions)
  - eap7-jboss-remoting (all versions)
  - eap7-jboss-server-migration (all versions)
  - eap7-netty (all versions)
  - eap7-netty-transport-native-epoll (all versions)
  - eap7-picketlink-bindings (all versions)
  - eap7-picketlink-federation (all versions)
  - eap7-undertow (all versions)
  - eap7-wildfly (all versions)
  - eap7-activemq-artemis (all versions)
  - eap7-glassfish-jsf (all versions)
  - eap7-ironjacamar (all versions)
  - eap7-jackson-annotations (all versions)
  - eap7-jackson-core (all versions)
  - eap7-jackson-databind (all versions)
  - eap7-jackson-jaxrs-providers (all versions)
  - eap7-jackson-modules-base (all versions)
  - eap7-jackson-modules-java8 (all versions)
  - eap7-jboss-remoting (all versions)
  - eap7-jboss-server-migration (all versions)
  - eap7-netty (all versions)
  - eap7-netty-transport-native-epoll (all versions)
  - eap7-picketlink-bindings (all versions)
  - eap7-picketlink-federation (all versions)
  - eap7-undertow (all versions)
  - eap7-wildfly (all versions)
  - eap7-activemq-artemis (all versions)
  - eap7-glassfish-jsf (all versions)
  - eap7-ironjacamar (all versions)
  - eap7-jackson-annotations (all versions)
  - eap7-jackson-core (all versions)
  - eap7-jackson-databind (all versions)
  - eap7-jackson-jaxrs-providers (all versions)
  - eap7-jackson-modules-base (all versions)
  - eap7-jackson-modules-java8 (all versions)
  - eap7-jboss-remoting (all versions)
  - eap7-jboss-server-migration (all versions)
  - eap7-netty (all versions)
  - eap7-netty-transport-native-epoll (all versions)
  - eap7-picketlink-bindings (all versions)
  - eap7-picketlink-federation (all versions)
patched:
  - jboss_eap_7_4_els_for_rhel_7_server
  - jboss_eap_7_4_els_for_rhel 8
  - jboss_eap_7_4_els_for_rhel 9
published: '2026-08-11'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T13:17:08.953'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15556'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:53644'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:53645'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:53646'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:53806'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-15556'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2483121'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-15556.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-15556'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15556'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-11T17:44:24.542979Z'
epss: 0.00238
epssPercentile: 0.1329
ingestedAt: '2026-09-17T19:26:25.289Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:53644** · Red Hat · fixed in: Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53644)
- **RHSA-2026:53645** · Red Hat · fixed in: Red Hat JBoss EAP 7.4 ELS for RHEL 8 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53645)
- **RHSA-2026:53646** · Red Hat · fixed in: Red Hat JBoss EAP 7.4 ELS for RHEL 9 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53646)
- **RHSA-2026:53806** · Red Hat · fixed in: Red Hat JBoss Enterprise Application Platform 7.4.25 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53806)
- **Red Hat VEX** · Important · affected: Red Hat JBoss Enterprise Application Platform 7 · no fix planned: Red Hat JBoss Enterprise Application Platform 7 · updated 2026-09-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-15556.json)