CVE-2026-102100 Kiteworks Core stored XSS
Authenticated users can inject scripts that execute in other users' sessions, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-102100?
CVE-2026-102100 is a high-severity cross-site scripting vulnerability in Accellion Kiteworks, published on 30 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Kiteworks Core before version 9.5.0 is vulnerable to Stored Cross-Site Scripting. A stored cross-site scripting (XSS) weakness in Kiteworks Core could allow an authenticated user to submit content that, when later viewed by another user, executes arbitrary JavaScript in that user's authenticated session. This could be used to perform actions on the victim's behalf and may have permitted account takeover, including of higher-privileged users. Exploitation requires the victim to view the attacker-supplied content.
Weakness: CWE-79
Which versions are affected by CVE-2026-102100?
It affects 1 product.
Products include Accellion Kiteworks.
How do I fix CVE-2026-102100?
No fix has been published for CVE-2026-102100 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-2026-102100 being exploited?
There is no known exploitation of CVE-2026-102100 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
- CVE-2026-102149 Kiteworks Email Protection Gateway Improper Access Control
- CVE-2026-102147 Kiteworks Core Administrative Account Takeover through Stored Cross-site Scripting (XSS)
- CVE-2026-102095 Kiteworks Email Protection Gateway server-side request forgery
- CVE-2026-102102 Kiteworks Email Protection Gateway server-side request forgery