Auth bypass in Kiteworks Email Protection Gateway

CVE-2026-102149

Kiteworks Email Protection Gateway did not sufficiently restrict which account a certificate could be assigned to. This could allow an attacker to associate a certificate with another user's account, affecting the confidentiality and integrity of that account's encrypted mail and, where certificate-based login is enabled, potentially permitting unauthorized access to the account.

Vulnerability class: Broken Authentication

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

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)

References

Frequently asked questions

What is CVE-2026-102149?
CVE-2026-102149 is a critical-severity vulnerability in Kiteworks Email Protection Gateway, classified under Missing Authentication for Critical Function. CVSS score: 9.4/10. Published 2026-09-30.
How severe is CVE-2026-102149?
Critical severity. CVSS v3 base score is 9.4 out of 10.