Auth bypass in Kiteworks Email Protection Gateway
CVE-2026-102143
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- 9119a7d8-5eab-497f-8521-727c672e3725
- 9119a7d8-5eab-497f-8521-727c672e3725 (third-party-advisory)
Frequently asked questions
- What is CVE-2026-102143?
- CVE-2026-102143 is a high-severity vulnerability in Kiteworks Email Protection Gateway, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-09-30.
- How severe is CVE-2026-102143?
- High severity. CVSS v3 base score is 7.5 out of 10.