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.

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 Kitew…

Vulnerability class: Unrestricted File Upload

EPSS: 0.010 (58.6th percentile) — read the EPSS interpretation.

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.

Affected products

Accellion Kiteworks
Kiteworks Secure Data Forms — versions < 9.2.1

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-2026-23636?: 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.