CVE-2025-53939Network attack vector

Share permission escalation via invalid role assignment

Published Nov 29, 2025 · Updated Dec 1, 2025

Improper input validation in Kiteworks Core before 9.1.0 allows remote authenticated users to elevate another user's shared-folder permissions. Shared-folder role management accepts an invalid role assignment and applies it without enforcing the intended permission boundary. An authenticated account with access to manage a shared folder is required, and the resulting privilege change is limited to that share.

CVSS severity6.3
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Kiteworks Core before 9.1.0 allows remote authenticated users to elevate another user's shared-folder permissions. Shared-folder role management accepts an invalid role assignment and applies it without enforcing the intended permission boundary. An authenticated account with access to manage a shared folder is required, and the resulting privilege change is limited to that share.

The record

CVE
CVE-2025-53939
Published
Nov 29, 2025
Updated
Dec 1, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.3GitHub CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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