What is CVE-2026-78401?

CVE-2026-78401 is a critical-severity vulnerability in IBM Security Verify Access, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-10-08.

How severe is CVE-2026-78401?

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

Deserialization in IBM Security Verify Access

CVE-2026-78401

IBM Security Verify Access 10.0 through 10.0.9.2 and IBM Verify Identity Access 11.0 through 11.0.3 could allow a remote unauthenticated attacker to execute arbitrary code on the system due to the deserialization of untrusted data.

Vulnerability class: Insecure Deserialization

Published 2026-10-08 · last modified 2026-10-09.

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.

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.

Affected products

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

www.ibm.com/support/pages/node/7291628 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-78401?: CVE-2026-78401 is a critical-severity vulnerability in IBM Security Verify Access, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-10-08.
How severe is CVE-2026-78401?: Critical severity. CVSS v3 base score is 9.8 out of 10.