What is CVE-2026-9802?

CVE-2026-9802 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Insufficient Session Expiration. CVSS score: 6.8/10. Published 2026-05-28.

How severe is CVE-2026-9802?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Red Hat Build Of Keycloak

CVE-2026-9802

A flaw was found in Keycloak. When revokeRefreshToken=true is enabled and persistent session storage is in use, a server restart can reset internal timing mechanisms. This allows a remote attacker, who has previously captured a user's refr…

EPSS: 0.000 (13.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry, Vendor Advisory)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-9802?: CVE-2026-9802 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Insufficient Session Expiration. CVSS score: 6.8/10. Published 2026-05-28.
How severe is CVE-2026-9802?: Medium severity. CVSS v3 base score is 6.8 out of 10.