CVE-2026-102126

Analyzed Analyzed - Analysis Complete

Stored XSS in Kiteworks Core

Publication date: 2026-09-30

Last updated on: 2026-10-07

Assigner: Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government

Description

A stored cross-site scripting (XSS) weakness in Kiteworks Core could allow an administrator holding only a single, narrowly scoped delegated permission to store crafted content that later executes arbitrary JavaScript in the authenticated session of a System Administrator who views the affected page. This could have permitted the lower-privileged administrator to escalate to full administrative control of the tenant, including the creation of a new administrative account.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-30

Last Modified

2026-10-07

Generated

2026-10-19

AI Q&A

2026-10-01

EPSS Evaluated

2026-10-18

NVD

CVE-2026-102126

EUVD

EUVD-2026-90291

Affected Vendors & Products

Vendor	Product	Version / Range
accellion	kiteworks	to 9.5.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in Kiteworks Core. It allows an administrator with limited permissions to store malicious content that executes arbitrary JavaScript when viewed by a System Administrator. This could let the lower-privileged admin gain full administrative control of the tenant, including creating new admin accounts.

Detection Guidance

This CVE describes a stored XSS vulnerability in Kiteworks Core. Detection requires reviewing Kiteworks Core configurations and logs for unauthorized script execution or suspicious content storage. Check for unusual JavaScript in admin-visible pages or delegated permission misuse. No specific commands are provided in the CVE details.

Impact Analysis

If exploited, this vulnerability could allow an attacker with limited admin access to escalate privileges to full system control. This includes taking over the entire tenant, accessing sensitive data, and performing unauthorized actions like creating new admin accounts.

Compliance Impact

This vulnerability could allow unauthorized privilege escalation to full administrative control, potentially leading to unauthorized access to sensitive data. This may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data privacy) by enabling unauthorized data exposure or modification.

Mitigation Strategies

Apply the latest security patches or updates provided by Kiteworks to address the stored XSS vulnerability. Review and restrict delegated permissions for administrators to minimize unnecessary access. Monitor system logs for suspicious activity or unauthorized administrative actions.

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