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Kiteworks Core CVE-2026-102129

| EUVDEUVD-2026-90288 HIGH
Incorrect Privilege Assignment (CWE-266)
2026-09-30 cisa-cg
7.2
CVSS 3.1 · Vendor: cisa-cg
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Authenticate as delegated role-management admin
  2. Delivery
    Open user-provisioning interface
  3. Exploit
    Assign system-administrator role to controlled account
  4. Execution
    Server skips entitlement check
  5. Impact
    Gain full sysadmin on appliance

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V8 - Authorization Privilege assignment review
Exploitation Conditions

Requires an authenticated Kiteworks Core administrator whose delegated permissions include role changes (user-provisioning/role management) but who is NOT intended to grant the system-administrator role. Exploitation is performed through the user-provisioning interface, which fails to verify the requester is entitled to grant the role being assigned. Limiting factors: the attacker must already possess valid privileged (delegated-admin) credentials/session (PR:H), so this is not exploitable by anonymous or ordinary-user accounts; environments that do not use scoped/delegated admin roles have no meaningful trust boundary to cross. No user interaction is required (UI:N).

Impact

This is a genuine privilege-escalation flaw but a LOW-to-MEDIUM operational priority, not a high-urgency issue despite the 7.2 (HIGH) score. The vendor CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H is well-founded and I concur: the PR:H is the decisive limiter - exploitation requires an already-authenticated administrator who holds delegated role-management permissions, so this is a trust-boundary/least-privilege failure among privileged operators rather than an externally reachable break-in. There is no EPSS score, no CISA KEV listing, and no public exploit identified at time of analysis, so all real-world-exploitation signals are absent; risk is bounded to environments that deploy delegated/scoped administrator roles and trust those delegates less than full sysadmins. The network attack vector (AV:N) reflects the web management interface but does not lower the authentication bar. The C:H/I:H/A:H triad is justified because escalation to full system-administrator yields total control of the Kiteworks appliance. No signals conflict; the main caveat is a mislabeled tag (see data_quality_flags) - the 'Information Disclosure' tag understates this, which is a full privilege-escalation/takeover primitive.

Exploit ScenarioDerived

An organization delegates limited administrative duties - such as managing user roles - to a helpdesk or team lead, expecting they cannot create super-admins. That delegated administrator uses the user-provisioning interface to assign the full system-administrator role to an account they control, and because the interface never checks whether the requester is entitled to grant that role, the assignment succeeds and yields complete appliance takeover. No public exploit code is available, and the attacker must already hold an authenticated delegated-admin session (PR:H).

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.5% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 30, 2026

Privilege escalation in Kiteworks Core allows a delegated administrator whose scope includes role changes to promote an account to full system-administrator through the user-provisioning interface, which fails to verify that the requester is entitled to grant the role being assigned (CWE-266). The CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, 7.2 High) confirms the flaw is network-reachable but requires high-privileged, delegated-admin credentials and no user interaction, so anonymous or ordinary-user accounts cannot exploit it and environments without scoped admin roles have no trust boundary to cross. No public exploit identified at time of analysis and no KEV listing; independent assessment rates this a genuine but low-to-medium operational priority rather than a high-urgency issue.

RemediationAI

Apply the fixed Kiteworks Core release identified in vendor advisory GHSA-4gcf-w86v-34rp and the corroborating CISA CSAF advisory va-26-274-01; the input data does not specify an exact patched version number, so the vendor advisory must be consulted for the version to upgrade to. Where immediate patching is not possible, the most effective compensating control is to remove the standalone role-change permission from delegated administrator profiles, either by eliminating scoped admin accounts that can modify roles or by narrowing them so role assignment is bundled with and constrained by full user-provisioning entitlements; the trade-off is that helpdesk and onboarding workflows relying on delegated role assignment must be rerouted through a full administrator or a supervised process. Also inventory every account holding delegated role-management rights and enable or retain audit logging on user-provisioning and role-change events so an unexpected promotion to system administrator is detected; monitoring alone does not prevent exploitation and should be treated as a detection layer rather than a fix.

Affected VersionsENISA

core 0 <9.5.1

Affected Packages

euvd core fix: 9.5.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Kiteworks Core is a managed file transfer and content-governance platform that supports delegated (scoped) administration, allowing a full administrator to hand subsets of management capability to other accounts. The flaw lives in that delegation model: one delegable scope is the ability to change user roles via the user-provisioning interface, and the affected code path authenticates the caller and checks that the caller holds a role-management grant, but never verifies that the specific role being assigned falls within that grant. This is a textbook CWE-266 (Incorrect Privilege Assignment) authorization gap, where the check covers the action taken rather than the privilege level granted, letting a narrowly scoped admin assign the system-administrator role and thereby escape the delegation boundary. The CVSS vector is scope-unchanged (S:U) with high confidentiality, integrity and availability impact once the promotion succeeds, because the resulting account is a full system administrator of the Kiteworks instance. The CPE entry cpe:2.3:a:kiteworks:core:*:*:*:*:*:*:*:* carries a wildcard version, indicating the advisory is written against the product as a whole rather than a bounded release line, so administrators should treat their installed version as affected until the vendor advisory states otherwise.

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Severity by source

Vendor (cisa-cg) PRIMARY 7.2 HIGH
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
vuln.today AI 7.2 HIGH

Requires an authenticated delegated administrator (PR:H) over the network web interface (AV:N) with no interaction; escalation to full sysadmin yields complete control, so C/I/A all High.

3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (cisa-cg).

CVSS VectorVendor: cisa-cg

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Patch available
Sep 30, 2026 - 21:04 EUVD
CVE Published
Sep 30, 2026 - 20:14 cve.org
HIGH 7.2

DescriptionCVE.org

A user-provisioning interface in Kiteworks Core did not verify that the requesting administrator was entitled to grant the role being assigned. An administrator whose delegated permissions covered role changes alone could therefore raise an account to full system-administrator privileges.

Technical POC Analysis

The flaw is CWE-266 (Incorrect Privilege Assignment).

Full technical POC analysis - root cause, step-by-step exploitation and patch breakdown - is part of the Pro and Business plans.

Executive ViewAI

Why It Matters

A privilege-escalation flaw in Kiteworks Core lets a delegated administrator with role-management scope elevate an account to full system administrator, collapsing the separation-of-duties controls that organizations rely on to keep delegated administration contained. Any enterprise running Kiteworks with scoped or delegated admin roles is exposed, and a successful abuse would give an insider or compromised admin account unrestricted control over the content-governance platform, including sensitive file-sharing data and its user base. Exploitation requires pre-existing high-privilege access and no public exploit code or active exploitation has been identified, so leadership should treat this as a contained, medium-priority governance gap rather than an emergency.

Business Impact: Medium
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: revoke or restrict role-assignment permissions from delegated administrator accounts, enforce least privilege and reduce the number of scoped admins, require multi-factor authentication and just-in-time approval for administrative role changes, monitor and alert on user-provisioning and privilege-grant events, and confirm with Kiteworks whether configuration hardening or a hotfix is available.

Threat Intelligence Overview

EPSS Score
0.5%
Top 60% exploitable
Prevalence
Medium
enterprise secure file-sharing/MFT appliance, common but not ubiquitous
Data Quality
6 sources
Confidence: High

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.5%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
Medium
Technical Impact
Total

Priority Score

36
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0
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