CVE-2026-97846
CVE-2026-97846
Keycloak provides a feature called mTLS holder-of-key binding which ensures that a token can only be used by the client that originally requested it by binding it to their digital certificate. A flaw was discovered where the new Standard Token Exchange V2 feature does not check for this certificate. This allows an attacker with stolen client credentials to obtain a standard, unrestricted token that bypasses these security protections.
Vulnerability class: Broken Authentication
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
EPSS: 0.002 (4.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-97846 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- access.redhat.com/errata/RHSA-2026:95761 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-97846?
- CVE-2026-97846 is a medium-severity vulnerability, classified under Improper Authentication. CVSS score: 6.8/10. Published 2026-09-25.
- How severe is CVE-2026-97846?
- Medium severity. CVSS v3 base score is 6.8 out of 10.