CVE-2026-102104

Received Received - Intake

Server-Side Request Forgery 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 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.

CVSS Scores

EPSS 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-2026-102104

EUVD

EUVD-2026-90297

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 is vulnerable to Server-Side Request Forgery (SSRF). This allows a remote, unauthenticated attacker to trick the gateway into making crafted requests to internal or unintended network destinations. The vulnerability is triggered when the gateway performs an online certificate status check for an inbound message.

Detection Guidance

Detecting SSRF vulnerabilities typically involves monitoring network traffic for unusual outbound requests from the Kiteworks Email Protection Gateway. Check gateway logs for certificate status check requests to internal or unexpected destinations. Use network scanning tools like nmap to identify if the gateway is making requests to unintended hosts.

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 the services reachable from the gateway, potentially leading to data breaches or service outages.

Mitigation Strategies

Upgrade Kiteworks Email Protection Gateway to version 9.5.0 or later to address the SSRF vulnerability. If immediate upgrade is not possible, restrict outbound network access from the gateway to only necessary destinations and implement strict firewall rules to block unauthorized requests.

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