Vulnerability · Published Sep 30, 2026 · Assigned by cisa-cg
CVE-2026-102104Kiteworks Email Protection Gateway server-side request forgery
Critical 9.1
In plain English
A critical-severity server-side request forgery in Email Protection Gateway from Kiteworks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Official description
Kiteworks Email Protection Gateway before version 9.5.0 is vulnerable to Server-Side Request Forgery (SSRF). A server-side request forgery (SSRF) weakness in Kiteworks Email Protection Gateway could allow a remote, unauthenticated attacker to induce the gateway to issue crafted requests to internal or otherwise unintended network destinations. The requests are triggered while the gateway performs an online certificate status check for an inbound message. Depending on the services reachable from the gateway, this could disclose sensitive internal information or disrupt gateway operation.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Kiteworks | Email Protection Gateway | 0 – before 9.5.0 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H