High severity · published Sep 30, 2026
CVE-2026-102128
Kiteworks Email Protection Gateway Improper Authentication
7.5
CVSS
0.2%
EPSS
No
On KEV
Description
An identity-verification weakness in Kiteworks Email Protection Gateway allowed the gateway to act on the Kiteworks platform on behalf of a user it had not authenticated, and to provision a platform account for an identity it did not already know. A remote, unauthenticated sender could potentially exploit this to obtain control of a platform account.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EP
Email Protection Gateway · Kiteworks
before 9.5.1 · source: vendor
KI
Kiteworks · Accellion
before 9.5.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-102128
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102128
vendor-advisory
https://github.com/kiteworks/security-advisories/security/advisories/GHSA-qjvp-25r3-rgx6
third-party-advisory
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-274-01.json
More from Email Protection Gateway
9.4
CVE-2026-102149
Kiteworks Email Protection Gateway Improper Access Control
9.1
CVE-2026-102105
Kiteworks Email Protection Gateway server-side request forgery
9.1
CVE-2026-102106
Kiteworks Email Protection Gateway improper authentication
9.1
CVE-2026-102104
Kiteworks Email Protection Gateway server-side request forgery
9.1
CVE-2026-102103
Kiteworks Email Protection Gateway server-side request forgery