How severe is CVE-2026-28270?

CVE-2026-28270 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-28270 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28270?

CVE-2026-28270 affects Accellion Kiteworks. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28270?

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

Does CVE-2026-28270 have an EU (EUVD) identifier?

Yes. CVE-2026-28270 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9065.

When was CVE-2026-28270 published?

CVE-2026-28270 was published on 2026-02-27 and last updated on 2026-06-17.

CVE-2026-28270

CVE-2026-28270 is a medium-severity vulnerability in Accellion Kiteworks with a CVSS 3.x base score of 4.9. 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-434.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9065
Weakness: CWE-434
Affected product: Accellion Kiteworks
Published: 2026-02-27
Last modified: 2026-06-17

Description

Kiteworks is a private data network (PDN). Prior to version 9.2.0, a vulnerability in Kiteworks configuration allows uploading of arbitrary files without proper validation. Malicious administrators could exploit this to upload unauthorized file types to the system. Version 9.2.0 contains a patch for the issue.

Frequently asked questions

What is CVE-2026-28270?: Kiteworks is a private data network (PDN). Prior to version 9.2.0, a vulnerability in Kiteworks configuration allows uploading of arbitrary files without proper validation. Malicious administrators could exploit this to upload unauthorized file types to the system. Version 9.2.0 contains a patch for the issue.
How severe is CVE-2026-28270?: CVE-2026-28270 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-28270 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28270?: CVE-2026-28270 affects Accellion Kiteworks. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28270?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-28270 have an EU (EUVD) identifier?: Yes. CVE-2026-28270 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9065.
When was CVE-2026-28270 published?: CVE-2026-28270 was published on 2026-02-27 and last updated on 2026-06-17.

References

https://github.com/kiteworks/security-advisories/security/advisories/GHSA-v8x9-vwg6-cj45

Affected products (1)

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

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