How severe is CVE-2026-23636?

CVE-2026-23636 has a CVSS 3.x base score of 5.5, 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 low.

Is CVE-2026-23636 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23636?

CVE-2026-23636 affects Accellion Kiteworks. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23636?

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

Does CVE-2026-23636 have an EU (EUVD) identifier?

Yes. CVE-2026-23636 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-15541.

When was CVE-2026-23636 published?

CVE-2026-23636 was published on 2026-03-25 and last updated on 2026-06-17.

CVE-2026-23636

CVE-2026-23636 is a medium-severity vulnerability in Accellion Kiteworks with a CVSS 3.x base score of 5.5. 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 5.5)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-15541
Weakness: CWE-434
Affected product: Accellion Kiteworks
Published: 2026-03-25
Last modified: 2026-06-17

Description

Kiteworks is a private data network (PDN). In Kiteworks Secure Data Forms prior to version 9.2.1, the manager of a form could potentially exploit an Unrestricted Upload of File with Dangerous Type due to a missing validation. Upgrade Kiteworks to version 9.2.1 or later to receive a patch.

Frequently asked questions

What is CVE-2026-23636?: Kiteworks is a private data network (PDN). In Kiteworks Secure Data Forms prior to version 9.2.1, the manager of a form could potentially exploit an Unrestricted Upload of File with Dangerous Type due to a missing validation. Upgrade Kiteworks to version 9.2.1 or later to receive a patch.
How severe is CVE-2026-23636?: CVE-2026-23636 has a CVSS 3.x base score of 5.5, 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 low.
Is CVE-2026-23636 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23636?: CVE-2026-23636 affects Accellion Kiteworks. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23636?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23636 have an EU (EUVD) identifier?: Yes. CVE-2026-23636 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-15541.
When was CVE-2026-23636 published?: CVE-2026-23636 was published on 2026-03-25 and last updated on 2026-06-17.

References

https://github.com/kiteworks/security-advisories/security/advisories/GHSA-cfv8-p3hq-8wmm

Affected products (1)

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

More vulnerabilities in Accellion Kiteworks

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Other CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities

CVE-2026-39770 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Upload in Doctreat <= 1.7.0 versions.
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CVE-2026-102427 — Critical (CVSS 10.0): Joomla Extension - ordasoft.com - Unauthenticated Remote Code Execution in OrdaSoft Joomla CCK < 8.3.16 -…
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CVE-2026-84147 — Critical (CVSS 10.0): This vulnerability exists in the ERP system due to improper authentication controls and inadequate file type validation…
CVE-2026-81780 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Upload in Hash Form <= 1.4.2 versions.

Browse all CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities →