How severe is CVE-2025-53899?

CVE-2025-53899 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-53899 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-53899?

CVE-2025-53899 affects Accellion Kiteworks Managed File Transfer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-53899?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-53899 have an EU (EUVD) identifier?

Yes. CVE-2025-53899 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199896.

When was CVE-2025-53899 published?

CVE-2025-53899 was published on 2025-11-29 and last updated on 2026-06-17.

CVE-2025-53899

CVE-2025-53899 is a high-severity vulnerability in Accellion Kiteworks Managed File Transfer with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-941.

Key facts

Severity: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199896
Weakness: CWE-941
Affected product: Accellion Kiteworks Managed File Transfer
Published: 2025-11-29
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-53899?: CVE-2025-53899 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-53899 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-53899?: CVE-2025-53899 affects Accellion Kiteworks Managed File Transfer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-53899?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-53899 have an EU (EUVD) identifier?: Yes. CVE-2025-53899 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199896.
When was CVE-2025-53899 published?: CVE-2025-53899 was published on 2025-11-29 and last updated on 2026-06-17.

References

https://github.com/kiteworks/security-advisories/security/advisories/GHSA-5gx5-vcpp-8cr5

Affected products (1)

cpe:2.3:a:accellion:kiteworks_managed_file_transfer:*:*:*:*:*:*:*:*

More vulnerabilities in Accellion Kiteworks Managed File Transfer

CVE-2025-53896 — High (CVSS 7.1): Kiteworks MFT orchestrates end-to-end file transfer workflows. Prior to version 9.1.0, a bug in Kiteworks MFT could…
CVE-2025-53897 — Medium (CVSS 6.8): Kiteworks MFT orchestrates end-to-end file transfer workflows. Prior to version 9.1.0, this vulnerability could allow…
CVE-2025-53900 — Medium (CVSS 6.5): Kiteworks MFT orchestrates end-to-end file transfer workflows. Prior to version 9.1.0, an unfavourable definition of…

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