CVE-2026-102143: CWE-306 Missing Authentication for Critical Function in Kiteworks Email Protection Gateway
CVE-2026-102143 is a vulnerability in Kiteworks Email Protection Gateway where an unauthenticated attacker can write a file with attacker-controlled content to the appliance filesystem via an administrative upload handler that lacks proper authentication. This flaw does not directly allow code execution, as that would require an additional vulnerability to place the file in an executable location. The issue affects versions prior to 9.5.1.
AI Analysis
Technical Summary
This vulnerability (CWE-306) arises from missing authentication on a critical administrative upload function in Kiteworks Email Protection Gateway. An unauthenticated attacker can exploit this to write arbitrary files to the appliance filesystem. Although this does not immediately enable code execution, it compromises the integrity of the system and could be leveraged in combination with other vulnerabilities. The affected versions are all releases before 9.5.1.
Potential Impact
The vulnerability allows an unauthenticated attacker to write files with attacker-controlled content to the appliance filesystem, potentially leading to integrity violations. However, it does not by itself enable code execution or availability impact. The confidentiality impact is none, but the integrity impact is high due to unauthorized file writes.
Mitigation Recommendations
No patch links or vendor advisories are provided in the input data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the administrative upload interface and monitor for unauthorized file uploads.
CVE-2026-102143: CWE-306 Missing Authentication for Critical Function in Kiteworks Email Protection Gateway
Description
CVE-2026-102143 is a vulnerability in Kiteworks Email Protection Gateway where an unauthenticated attacker can write a file with attacker-controlled content to the appliance filesystem via an administrative upload handler that lacks proper authentication. This flaw does not directly allow code execution, as that would require an additional vulnerability to place the file in an executable location. The issue affects versions prior to 9.5.1.
CVSS v3.1
Score 7.5high
Affected software
Kiteworks
Email Protection Gateway
pkg:github/kiteworks/email-protection-gatewayRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-306) arises from missing authentication on a critical administrative upload function in Kiteworks Email Protection Gateway. An unauthenticated attacker can exploit this to write arbitrary files to the appliance filesystem. Although this does not immediately enable code execution, it compromises the integrity of the system and could be leveraged in combination with other vulnerabilities. The affected versions are all releases before 9.5.1.
Potential Impact
The vulnerability allows an unauthenticated attacker to write files with attacker-controlled content to the appliance filesystem, potentially leading to integrity violations. However, it does not by itself enable code execution or availability impact. The confidentiality impact is none, but the integrity impact is high due to unauthorized file writes.
Mitigation Recommendations
No patch links or vendor advisories are provided in the input data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the administrative upload interface and monitor for unauthorized file uploads.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisa-cg
- Date Reserved
- 2026-09-28T17:39:13.564Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abd72512a4e24523d8ebe32
Added to database: 09/30/2026, 20:34:25 UTC
Last enriched: 09/30/2026, 20:49:05 UTC
Last updated: 10/01/2026, 04:47:33 UTC
Views: 11
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