Quick answers
- Is CVE-2026-102139 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-102139 being exploited in the wild.
- How severe is CVE-2026-102139?
- Medium severity, with a CVSS score of 6.5, published 30 September 2026.
- Which products and versions are affected?
- Kiteworks Email Protection Gateway before 9.5.1.
- Is there a fix for CVE-2026-102139?
- A patch was published on 2026-09-30: Version 9.5.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-102139 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-102139?
- 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
An authorization check in the large file exchange feature fails to verify that the requesting user is an authorized party to the package being accessed (CWE-863, CWE-639). An authenticated user with access to the feature can craft requests to read subject lines, message bodies, and attachments of arbitrary packages by bypassing the access control. The vulnerability requires authentication and network access but no user interaction, and affects all versions prior to 9.5.1.
Affected products
- Kiteworks Email Protection Gateway before 9.5.1
Timeline
- 2026-09-30: disclosed
- 2026-09-30: patched: Version 9.5.1