CVE-2026-97174
CVE-2026-97174
A flaw was found in the Client-Initiated Backchannel Authentication (CIBA) implementation of Keycloak. The CIBA endpoint fails to properly validate the sub parameter, allowing it to be stored as an additional request parameter. During the token issuance process, this injected value overwrites the legitimate subject identifier. This allows an attacker to authenticate as themselves but receive security tokens belonging to a different victim user, leading to unauthorized account access.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- RHSA-2026:95761 (vendor-advisory)
- RHSA-2026:95762 (vendor-advisory)
- access.redhat.com/security/cve/CVE-2026-97174 (vdb-entry)
- RHBZ#2539961 (issue-tracking)
Frequently asked questions
- What is CVE-2026-97174?
- CVE-2026-97174 is a medium-severity vulnerability, classified under Improper Input Validation. CVSS score: 6.8/10. Published 2026-11-05.
- How severe is CVE-2026-97174?
- Medium severity. CVSS v3 base score is 6.8 out of 10.