Arbitrary file upload in Accellion Kiteworks

CVE-2026-23636

Kiteworks is a private data network (PDN). In Kiteworks Secure Data Forms prior to version 9.2.1, the manager of a form could potentially exploit an Unrestricted Upload of File with Dangerous Type due to a missing validation. Upgrade Kiteworks to version 9.2.1 or later to receive a patch.

Vulnerability class: Unrestricted File Upload

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L.

EPSS exploit prediction

EPSS: 0.010 (61.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 61.9% 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-2026-23636: held from 0.010 to 0.010.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-23636?
CVE-2026-23636 is a medium-severity vulnerability in Accellion Kiteworks, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.5/10. Published 2026-03-25.
How severe is CVE-2026-23636?
Medium severity. CVSS v3 base score is 5.5 out of 10.