Vulnerability DatabaseCVE-2026-93998
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CVE-2026-93998
Published:November 05, 2026
Updated:November 09, 2026
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 Packages
https://github.com/keycloak/keycloak.git (GITHUB):
Affected version(s) >=1.6.0.Final <26.8.2 || >=2.0.0.CR1 <26.8.2 || >=3.0.0.CR1 <26.8.2 || >=4.0.0.Beta1 <26.8.2 || =5.0.0 <26.8.2 || >=6.0.0 <26.8.2 || >=7.0.0 <26.8.2 || >=8.0.0 <26.8.2 || >=9.0.0 <26.8.2 || >=10.0.0 <26.8.2 || >=11.0.0 <26.8.2 || >=12.0.0 <26.8.2 || >=13.0.0 <26.8.2 || =14.0.0 <26.8.2 || >=15.0.0 <26.8.2 || >=16.0.0 <26.8.2 || >=17.0.0 <26.8.2 || >=18.0.0 <26.8.2 || >=19.0.0 <26.8.2 || >=20.0.0 <26.8.2 || >=21.0.0 <26.8.2 || >=22.0.0 <26.8.2 || >=23.0.0 <26.8.2 || >=24.0.0 <26.8.2 || >=25.0.0 <26.8.2 || >=26.7.0 <26.8.2
Fix Suggestion:
Update to version 26.8.2
https://github.com/keycloak/keycloak.git (GITHUB):
Affected version(s) >=26.0.0 <26.4.17
Fix Suggestion:
Update to version 26.4.17
https://github.com/keycloak/keycloak.git (GITHUB):
Affected version(s) >=26.5.0 <26.6.8
Fix Suggestion:
Update to version 26.6.8
org.keycloak:keycloak-saml-adapter-core (JAVA):
Affected version(s) >=15.0.0 <26.8.2 || >=7.0.0 <26.8.2 || >=21.0.0 <26.8.2 || >=24.0.0 <26.8.2 || >=22.0.0 <26.8.2 || >=12.0.0 <26.8.2 || >=8.0.0 <26.8.2 || =5.0.0 <26.8.2 || >=23.0.0 <26.8.2 || >=26.7.0 <26.8.2 || >=17.0.0 <26.8.2 || =14.0.0 <26.8.2 || >=11.0.0 <26.8.2 || >=13.0.0 <26.8.2 || >=16.0.0 <26.8.2 || >=10.0.0 <26.8.2 || >=19.0.0 <26.8.2 || >=25.0.0 <26.8.2 || >=20.0.0 <26.8.2 || >=6.0.0 <26.8.2 || >=18.0.0 <26.8.2 || >=1.6.0.Final <26.8.2 || >=9.0.0 <26.8.2 || >=4.0.0.Beta1 <26.8.2 || >=3.0.0.CR1 <26.8.2 || >=2.0.0.CR1 <26.8.2
Fix Suggestion:
Update to version 26.8.2
org.keycloak:keycloak-saml-adapter-core (JAVA):
Affected version(s) >=26.0.0 <26.4.18.redhat-00001
Fix Suggestion:
Update to version 26.4.18.redhat-00001
org.keycloak:keycloak-saml-adapter-core (JAVA):
Affected version(s) >=26.5.0 <26.6.8.redhat-00002
Fix Suggestion:
Update to version 26.6.8.redhat-00002
Related Resources (6)
https://access.redhat.com/errata/RHSA-2026:95761
https://bugzilla.redhat.com/show_bug.cgi?id=2537164
https://access.redhat.com/errata/RHSA-2026:95759
https://access.redhat.com/errata/RHSA-2026:95762
https://access.redhat.com/security/cve/CVE-2026-93998
https://access.redhat.com/errata/RHSA-2026:95760
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CVSS v4
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.4
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Verification of Cryptographic Signature
CWE-347
EPSS
Base Score:
0.26