How severe is CVE-2025-53939?

CVE-2025-53939 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-53939 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-53939?

CVE-2025-53939 affects Accellion Kiteworks. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-53939?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-53939 have an EU (EUVD) identifier?

Yes. CVE-2025-53939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199894.

When was CVE-2025-53939 published?

CVE-2025-53939 was published on 2025-11-29 and last updated on 2026-06-17.

CVE-2025-53939

CVE-2025-53939 is a medium-severity vulnerability in Accellion Kiteworks with a CVSS 3.x base score of 6.3. 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199894
Weakness: CWE-20
Affected product: Accellion Kiteworks
Published: 2025-11-29
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-53939?: 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.
How severe is CVE-2025-53939?: CVE-2025-53939 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-53939 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-53939?: CVE-2025-53939 affects Accellion Kiteworks. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-53939?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-53939 have an EU (EUVD) identifier?: Yes. CVE-2025-53939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199894.
When was CVE-2025-53939 published?: CVE-2025-53939 was published on 2025-11-29 and last updated on 2026-06-17.

References

https://github.com/kiteworks/security-advisories/security/advisories/GHSA-hpf5-6376-2565

Affected products (1)

cpe:2.3:a:accellion:kiteworks:*:*:*:*:*:*:*:*

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