High severity · published Feb 27, 2026
CVE-2026-28270
Kiteworks Core has an Unrestricted Upload of File with Dangerous Type
7.2
CVSS
1.8%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.8% · higher than 79% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · kiteworks
< 9.2.0 · source: vendor
KI
Kiteworks · Accellion
before 9.2.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28270
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28270
Vendor Advisory
https://github.com/kiteworks/security-advisories/security/advisories/GHSA-v8x9-vwg6-cj45
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