CVE-2026-102146 Kiteworks Email Protection Gateway Arbitrary File Write through Server-Side Template Injection

Vendor description

An authenticated Email Protection Gateway administrator holding only limited, delegated permissions could write files with attacker-controlled content to arbitrary locations accessible to the Email Protection Gateway service account. This exceeds the administrator's intended privileges and could be used to alter application files and configuration or to disrupt the availability of the service.

Reference data

Vendor

Kiteworks

Affected products

• Email Protection Gateway

CVSS 3.1

6.5 (MEDIUM)

Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

Weakness type

CWE-73: External Control of File Name or Path

Published

September 30, 2026

Official sources

• CVE.org
• NVD
• Vendor advisory

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