Critical severity · published Sep 30, 2026
CVE-2026-102149
Kiteworks Email Protection Gateway Improper Access Control
9.4
CVSS
0.2%
EPSS
No
On KEV
Description
Kiteworks Email Protection Gateway did not sufficiently restrict which account a certificate could be assigned to. This could allow an attacker to associate a certificate with another user's account, affecting the confidentiality and integrity of that account's encrypted mail and, where certificate-based login is enabled, potentially permitting unauthorized access to the account.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% 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-2026-102149
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102149
github.com
https://github.com/kiteworks/security-advisories/security/advisories/GHSA-c9w5-4frw-7wqq
third-party-advisory
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-274-01.json
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9.1
CVE-2026-102106
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CVE-2026-102104
Kiteworks Email Protection Gateway server-side request forgery
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CVE-2026-102103
Kiteworks Email Protection Gateway server-side request forgery
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CVE-2026-102102
Kiteworks Email Protection Gateway server-side request forgery