CVE-2026-102139 Kiteworks Email Protection Gateway Incorrect Authorization
Authenticated users can read unauthorized email packages in the optional large file exchange feature due to incorrect authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-102139?
CVE-2026-102139 is a medium-severity missing authorization vulnerability in Accellion Kiteworks, published on 30 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An authorization check in the large file exchange feature of Kiteworks Email Protection Gateway did not correctly establish that the requesting user was a party to the package being requested. An authenticated user of that optional feature could read the subject, message body, and attachments of packages they neither sent nor received.
Which versions are affected by CVE-2026-102139?
It affects 1 product.
Products include Accellion Kiteworks.
How do I fix CVE-2026-102139?
No fix has been published for CVE-2026-102139 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-102139 being exploited?
There is no known exploitation of CVE-2026-102139 in the wild and no public exploit code.
Other vulnerabilities in Accellion Kiteworks
- CVE-2026-102115 Kiteworks Core Authentication Bypass in the Password Reset Workflow
- CVE-2026-102149 Kiteworks Email Protection Gateway Improper Access Control
- CVE-2026-102147 Kiteworks Core Administrative Account Takeover through Stored Cross-site Scripting (XSS)
- CVE-2026-102095 Kiteworks Email Protection Gateway server-side request forgery
- CVE-2026-102102 Kiteworks Email Protection Gateway server-side request forgery