CVE-2026-102143

HIGH 7.5

Kiteworks Email Protection Gateway Unrestricted Upload of File with Dangerous Type

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

An unauthenticated attacker could cause a file with attacker-controlled content to be written to the appliance filesystem through an administrative upload handler that did not properly authenticate the request. This did not by itself result in code execution, which would require a separate vulnerability to place the file in an executable location.

CWE	CWE-306 CWE-434
Vendor	kiteworks
Product	email protection gateway
Published	Sep 30, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

Kiteworks / Email Protection Gateway

0 < 9.5.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/kiteworks/security-advisories/security/advisories/GHSA-3p9g-jh62-8f89 raw.githubusercontent.com: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-274-01.json

Credits

Supr4s, https://yeswehack.com/hunters/supr4s wlayzz, https://yeswehack.com/hunters/wlayzz Icare, https://yeswehack.com/hunters/icare truff, https://yeswehack.com/hunters/truff