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CVE-2026-102103

Kiteworks Email Protection Gateway server-side request forgery

CVSS 3.1 9.1 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-102103

Published

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 retrieves a certificate revocation list in an inbound message. Depending on the services reachable from the gateway, this could disclose sensitive internal information or disrupt gateway operation.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-102103

Published

Email Protection Gateway

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Kiteworks",
                    "product": "Email Protection Gateway",
                    "defaultStatus": "unknown",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "lessThan": "9.5.0",
                            "versionType": "custom"
                        },
                        {
                            "version": "9.5.0",
                            "status": "unaffected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON