Kiteworks Email Protection Gateway: Improper authentication in administrative service
Summary
An administrative service in Kiteworks Email Protection Gateway does not consistently enforce administrator authentication, so the password check can be bypassed. A remote, unauthenticated attacker who references a valid administrator account could create, modify or delete internal users and managed domains and change security-feature settings. Deleting a managed domain also removes its user accounts and could lock administrators out of the gateway.
Affected
- Kiteworks Email Protection Gateway versions before 9.5.0
Fixed in
- Fixed in 9.5.0 (vendor advisory GHSA-wwv8-qhqg-4q76)
- Vendor also lists later fixes in 9.5.1; the newest vendor release should be used
Workaround
Unknown. The vendor advisory describes no workaround; patching is the stated remedy.
Exploitation
- No confirmed exploitation of this CVE reported at the time of research
- No public proof of concept known
- CISA SSVC: exploitation none, automatable yes, technical impact partial
Our recommendation
- Confirm the installed EPG version; anything below 9.5.0 is affected
- Upgrade to the newest vendor release, including the 9.5.1 batch
- Remove or restrict internet access to the EPG administrative and web interfaces
- Review admin users, managed domains and security settings for unexpected changes
- Back up the configuration before upgrading
- Treat as urgent if the admin interface is reachable from untrusted networks (CVSS 9.1, CWE-287)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- GitHub Security Advisory GHSA-wwv8-qhqg-4q76 github.com
- CISA CSAF advisory VA-26-274-01 raw.githubusercontent.com
- OpenCVE CVE-2026-102106 app.opencve.io
- Strix CVE-2026-102106 www.strix.ai
- Kiteworks lifts shutdown warning after patching critical flaw (BleepingComputer) www.bleepingcomputer.com
- Kiteworks vulnerabilities (SecurityOnline) securityonline.info
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 07:53.
Original description (NVD)
Improper authentication in a Kiteworks Email Protection Gateway administrative service. An administrative service in Kiteworks Email Protection Gateway did not consistently enforce administrator authentication, so the required password check could be bypassed. An attacker who referenced a valid administrator account could potentially create, modify, or delete internal users and managed domains and change their security-feature configuration without authenticating; deleting a managed domain also removes its user accounts and could lock administrators out of the gateway.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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