Is CVE-2026-102104 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-102104 being exploited in the wild.

How severe is CVE-2026-102104?

Critical severity, with a CVSS score of 9.1, published 30 September 2026.

Which products and versions are affected?

Kiteworks Email Protection Gateway before 9.5.0.

Is there a fix for CVE-2026-102104?

A patch was published on 2026-09-30: version 9.5.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-102104 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-102104?

Check whether you run Kiteworks Email Protection Gateway at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-102104: Kiteworks Email Protection Gateway server-side request forgery

CVE-2026-102104 · Severity: critical · CVSS 9.1 · Published 2026-09-30

Kiteworks Email Protection Gateway is an email security appliance that protects organizations by filtering and monitoring inbound messages. A remote attacker without credentials can exploit a flaw in the certificate validation process to trick the gateway into making unauthorized requests to internal systems, potentially exposing sensitive data or disrupting email delivery.

Technologies: Kiteworks Email Protection Gateway. Vendors: Kiteworks.

Quick answers

Is CVE-2026-102104 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-102104 being exploited in the wild.
How severe is CVE-2026-102104?: Critical severity, with a CVSS score of 9.1, published 30 September 2026.
Which products and versions are affected?: Kiteworks Email Protection Gateway before 9.5.0.
Is there a fix for CVE-2026-102104?: A patch was published on 2026-09-30: version 9.5.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-102104 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-102104?: Check whether you run Kiteworks Email Protection Gateway at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a server-side request forgery (SSRF) in the online certificate status protocol (OCSP) check mechanism triggered during inbound message processing. An unauthenticated remote attacker can craft malicious messages that cause the gateway to issue requests to arbitrary internal or external destinations, leading to information disclosure or denial of service depending on reachable backend services.

Affected products

Kiteworks Email Protection Gateway before 9.5.0

Timeline

2026-09-30: disclosed
2026-09-30: patched: version 9.5.0

References

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