CVE-2026-102146

MEDIUM 6.5

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

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-73
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:H/UI:N/S:U/C:N/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

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-5pgq-v8g2-rg2f 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