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.

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…

Vulnerability class: Unrestricted File Upload

EPSS: 0.016 (73.2th percentile) — read the EPSS interpretation.

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.

Affected products

Accellion Kiteworks
Kiteworks Security-advisories — versions < 9.2.0

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

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.