What is CVE-2026-19117?

CVE-2026-19117 is a critical-severity vulnerability, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-09-02.

How severe is CVE-2026-19117?

Critical severity. CVSS v3 base score is 9.8 out of 10.

CVE-2026-19117

CVE-2026-19117

Under specific conditions, an attacker can register an attacker-controlled FIDO2 credential against a target account and then authenticate as that user. This issue affects on-premises deployments only.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

1443cd92-d354-46d2-9290-d812316ca43a

Frequently asked questions

What is CVE-2026-19117?: CVE-2026-19117 is a critical-severity vulnerability, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-09-02.
How severe is CVE-2026-19117?: Critical severity. CVSS v3 base score is 9.8 out of 10.