Vulnerability · Published Sep 30, 2026 · Assigned by cisa-cg

CVE-2026-102128Kiteworks Email Protection Gateway Improper Authentication

High 7.5

In plain English

A high-severity improper authentication in Email Protection Gateway from Kiteworks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.2%top 88.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

An identity-verification weakness in Kiteworks Email Protection Gateway allowed the gateway to act on the Kiteworks platform on behalf of a user it had not authenticated, and to provision a platform account for an identity it did not already know. A remote, unauthenticated sender could potentially exploit this to obtain control of a platform account.

Affected products (as reported)

Vendor	Product	Versions
Kiteworks	Email Protection Gateway	0 – before 9.5.1

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

url vendor-advisory
url third-party-advisory