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CVE-2026-18967

Keycloak-services: keycloak-services: saml onetimeuse assertion replay in idp-initiated broker flow

Published: Aug 6, 2026Updated: Aug 6, 2026 Sources: CVE List NVDCWE-294
6.4MEDIUM
NVD MITRE
EPSS Score
0.1%
Top 96.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
OpenVAS

Description

A flaw was found in the SAML broker component of Keycloak, an identity and access management solution. When configured as a SAML broker using the IdP-Initiated flow, Keycloak fails to enforce the OneTimeUse condition in SAML assertions. This allows an attacker who captures a valid, unused assertion to replay it multiple times. Successful exploitation could allow an attacker to hijack a user's session and gain unauthorized access to the system as that user.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:AAC:HPR:NUI:RS:UC:HI:HA:N
Exploitability
AV:AAttack Vector
Adjacent
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-294

Affected Products

Red Hat
commercial·US
Red Hat Build of Keycloak
Web & CMS Plugins
Red Hat JBoss Enterprise Application Platform Expansion PackOn-premOS
Operating Systems / linux-distro
Red Hat Single Sign-On 7On-premSecurity Product
Security Products / identity-access-mgmt

Exploitability

Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Defense Evasion
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References

https://access.redhat.com/security/cve/CVE-2026-18967
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2511604
bugzilla.redhat.com

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