CVE-2026-102126 Kiteworks Core Stored Cross-site Scripting (XSS)

What is CVE-2026-102126?

CVE-2026-102126 is a high-severity cross-site scripting vulnerability in Accellion Kiteworks, published on 30 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2026-102126?

It affects 1 product.

Products include Accellion Kiteworks.

How do I fix CVE-2026-102126?

No fix has been published for CVE-2026-102126 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-102126 being exploited?

There is no known exploitation of CVE-2026-102126 in the wild and no public exploit code.

Other vulnerabilities in Accellion Kiteworks

• CVE-2026-102115 Kiteworks Core Authentication Bypass in the Password Reset Workflow Critical 9.8
• CVE-2026-102149 Kiteworks Email Protection Gateway Improper Access Control Critical 9.4
• CVE-2026-102147 Kiteworks Core Administrative Account Takeover through Stored Cross-site Scripting (XSS) Critical 9.3
• CVE-2026-102095 Kiteworks Email Protection Gateway server-side request forgery Critical 9.1
• CVE-2026-102102 Kiteworks Email Protection Gateway server-side request forgery Critical 9.1

All Accellion Kiteworks vulnerabilities

Sources

• CVE record
• NVD
• OSV
• How this page is made