CVE-2025-53939 Kiteworks Core is vulnerable to Improper Input Validation
Kiteworks Core allows attackers to elevate another user's permissions on a shared folder due to improper input validation.
- 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-2025-53939?
CVE-2025-53939 is a medium-severity vulnerability in Accellion Kiteworks, published on 29 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Kiteworks is a private data network (PDN). Prior to version 9.1.0, improper input validation when managing roles of a shared folder could lead to unexpectedly elevate another user's permissions on the share. This issue has been patched in version 9.1.0.
Weakness: CWE-20
Which versions are affected by CVE-2025-53939?
It affects 1 product.
Products include Accellion Kiteworks.
How do I fix CVE-2025-53939?
No fix has been published for CVE-2025-53939 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-53939 being exploited?
There is no known exploitation of CVE-2025-53939 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