Authorization Flaw in Kiteworks Email Protection Gateway
CVE-2026-102139

6.5MEDIUM

Key Information:

Vendor

Kiteworks

Status
Email Protection Gateway
Vendor
CVE Published:
30 September 2026

What is CVE-2026-102139?

An issue has been identified in the Kiteworks Email Protection Gateway where the authorization check for its large file exchange feature is insufficient. This flaw allows authenticated users to access emails, including subject lines, message bodies, and attachments of packages they did not send or receive. As a consequence, sensitive information can be exposed, posing serious risks to user privacy and data integrity.

Affected Version(s)

Email Protection Gateway 0 < 9.5.1

Email Protection Gateway 9.5.1

References

https://github.com/kiteworks/security-advisories/security...
https://raw.githubusercontent.com/cisagov/CSAF/develop/cs...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.