CVE-2026-102139

Kiteworks Email Protection Gateway Incorrect Authorization

State: Published
Severity: 6.5 Medium
Published: Sep 30, 2026
Updated: Oct 1, 2026
Reserved: Sep 28, 2026

Description

An authorization check in the large file exchange feature of Kiteworks Email Protection Gateway did not correctly establish that the requesting user was a party to the package being requested. An authenticated user of that optional feature could read the subject, message body, and attachments of packages they neither sent nor received.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	cisa-cg

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key
CWE-863 Incorrect Authorization

Affected Products

Product	Versions
Email Protection GatewayKiteworks	before 9.5.1Affected 9.5.1Not affected

References

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