Vulnerability in Red Hat Build Of Keycloak 26.4
CVE-2026-1190
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2026:3947 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:3948 (vendor-advisory)
- access.redhat.com/security/cve/CVE-2026-1190 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
Frequently asked questions
- What is CVE-2026-1190?
- CVE-2026-1190 is a low-severity vulnerability in Red Hat Build Of Keycloak 26.4, classified under CWE-112. CVSS score: 3.1/10. Published 2026-01-26.
- How severe is CVE-2026-1190?
- Low severity. CVSS v3 base score is 3.1 out of 10.