What is CVE-2025-53899?

CVE-2025-53899 is a high-severity vulnerability in Accellion Kiteworks Managed File Transfer, classified under CWE-941. CVSS score: 7.2/10. Published 2025-11-29.

How severe is CVE-2025-53899?

High severity. CVSS v3 base score is 7.2 out of 10.

Vulnerability in Accellion Kiteworks Managed File Transfer

CVE-2025-53899

Kiteworks MFT orchestrates end-to-end file transfer workflows. Prior to version 9.1.0, the back-end of Kiteworks MFT is vulnerable to an incorrectly specified destination in a communication channel which allows an attacker with administrative privileges on the system under certain circumstances to intercept upstream communication which could lead to an escalation of privileges. This issue has been patched in version 9.1.0.

EPSS: 0.009 (58.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Accellion Kiteworks_managed_file_transfer
Kiteworks Security-advisories — versions < 9.1.0

Weakness classification (CWE)

CWE-941

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2025-53899?: CVE-2025-53899 is a high-severity vulnerability in Accellion Kiteworks Managed File Transfer, classified under CWE-941. CVSS score: 7.2/10. Published 2025-11-29.
How severe is CVE-2025-53899?: High severity. CVSS v3 base score is 7.2 out of 10.