Arbitrary file upload in Accellion Kiteworks

CVE-2026-28270

Kiteworks is a private data network (PDN). Prior to version 9.2.0, a vulnerability in Kiteworks configuration allows uploading of arbitrary files without proper validation. Malicious administrators could exploit this to upload unauthorized file types to the system. Version 9.2.0 contains a patch for the issue.

Vulnerability class: Unrestricted File Upload

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.022 (82.1th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-28270: rose from 0.016 to 0.022.

EPSS over last 30 days · oldest: 0.016 · newest: 0.022 · change: +0.006

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-28270?
CVE-2026-28270 is a medium-severity vulnerability in Accellion Kiteworks, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 4.9/10. Published 2026-02-27.
How severe is CVE-2026-28270?
Medium severity. CVSS v3 base score is 4.9 out of 10.