---
id: CVE-2026-93998
title: >-
  Keycloak-core: keycloak-core: saml adapter does not bind signed assertions to
  the configured identity provider issuer
summary: >-
  A flaw was found in the SAML adapter component of Keycloak, which is used to
  secure applications with SAML-based authentication. The adapter fails to
  verify that the issuer of a signed SAML assertion matches the expected
  identity provide…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-347
vendor: Red Hat
product: keycloak-core
affected:
  - keycloak-core
  - keycloak-core (all versions)
  - keycloak/rhbk-openshift-rhel9 (all versions)
  - keycloak/rhbk-rhel9-operator (all versions)
  - rhbk/keycloak-rhel9 (all versions)
  - rhbk/keycloak-rhel9-operator (all versions)
  - keycloak-core
  - jboss-eap-7/eap74-els-openjdk11-openshift-rhel8
  - jboss-eap-7/eap74-els-openjdk17-openshift-rhel8
  - jboss-eap-7/eap74-els-openjdk8-openshift-rhel8
  - keycloak-core
  - keycloak-core
  - candlepin
  - keycloak-core
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-05T18:48:00.549997Z'
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T18:48:33.460Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-93998'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93998'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2537164'
    label: RHBZ#2537164
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.480Z'
---

## Overview

A flaw was found in the SAML adapter component of Keycloak, which is used to secure applications with SAML-based authentication. The adapter fails to verify that the issuer of a signed SAML assertion matches the expected identity provider configured for the application. If multiple identity providers share the same trusted signing key, an attacker who controls one of those providers can create a validly signed assertion to log into the application as any user, potentially gaining full administrative control.

## Affected

- `keycloak-core`
- `keycloak-core (all versions)`
- `keycloak/rhbk-openshift-rhel9 (all versions)`
- `keycloak/rhbk-rhel9-operator (all versions)`
- `rhbk/keycloak-rhel9 (all versions)`
- `rhbk/keycloak-rhel9-operator (all versions)`
- `keycloak-core`
- `jboss-eap-7/eap74-els-openjdk11-openshift-rhel8`
- `jboss-eap-7/eap74-els-openjdk17-openshift-rhel8`
- `jboss-eap-7/eap74-els-openjdk8-openshift-rhel8`
- `keycloak-core`
- `keycloak-core`
- `candlepin`
- `keycloak-core`

## Remediation

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

### Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.