CVE-2026-102103

Received Received - Intake

SSRF in Kiteworks Email Protection Gateway

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government

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 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.

CVSS Scores

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Meta Information

Published

2026-09-30

Last Modified

2026-09-30

Generated

2026-10-01

AI Q&A

2026-10-01

EPSS Evaluated

N/A

NVD

CVE-2026-102103

EUVD

EUVD-2026-90294

Affected Vendors & Products

Vendor	Product	Version / Range
kiteworks	email_protection_gateway	to 9.5.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

Kiteworks Email Protection Gateway before version 9.5.0 has a Server-Side Request Forgery (SSRF) vulnerability. This allows a remote, unauthenticated attacker to trick the gateway into making crafted requests to internal or unintended network destinations. The issue occurs when the gateway retrieves a certificate revocation list from an inbound message.

Detection Guidance

Detection involves monitoring network traffic for unusual outbound requests from the Kiteworks Email Protection Gateway, particularly during certificate revocation list retrieval. Check gateway logs for unexpected connections to internal or external systems. Use network scanning tools to identify if the gateway is initiating requests to unintended destinations.

Impact Analysis

This vulnerability could allow an attacker to access sensitive internal information or disrupt the operation of the Kiteworks Email Protection Gateway. The impact depends on which internal services are reachable from the gateway.

Mitigation Strategies

Immediately upgrade Kiteworks Email Protection Gateway to version 9.5.0 or later to address the SSRF vulnerability. If an upgrade is not immediately possible, restrict outbound network access from the gateway to only necessary destinations and monitor for suspicious activity.

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