CVE-2026-1190

3.1 lowEPSS 0.4%

A flaw was found in Keycloak's SAML brokering functionality. When Keycloak is configured as a client in a Security Assertion Markup Language (SAML) setup, it fails to validate the `NotOnOrAfter` timestamp within the `SubjectConfirmationData`. This allows an attacker to delay the expiration of SAML responses, potentially extending the time a response is considered valid and leading to unexpected session durations or resource consumption.

Severity

CVSS 3.1

3.1 low

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-31)
CWE: CWE-112
Published: 2026-01-26
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Packages (OSV)

Advisory	Ecosystem	Package	Affected	Fixed in
GHSA-63v5-26vq-m4vm	Maven	org.keycloak:keycloak-services	<=26.5.2	no fix published

References

https://access.redhat.com/errata/RHSA-2026:3947
https://access.redhat.com/errata/RHSA-2026:3948
https://access.redhat.com/security/cve/CVE-2026-1190
https://bugzilla.redhat.com/show_bug.cgi?id=2430835

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