CVE-2025-59898 Authenticated Cross-Site Scripting (XSS) vulnerability in Sync Breeze Enterprise Server

Medium 5.1 Published 28 Jan 2026 Updated 28 Jan 2026

An attacker can inject malicious scripts into the exclude_dir parameter to steal session information from authenticated users of Sync Breeze Enterprise Server.

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-2025-59898?

CVE-2025-59898 is a medium-severity cross-site scripting vulnerability in Flexense Disk Pulse Enterprise, published on 28 Jan 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

Sync Breeze Enterprise Server v10.4.18 and Disk Pulse Enterprise v10.4.18 contain a persistent authenticated Cross-Site Scripting (XSS) vulnerability. An attacker could send malicious content to an authenticated user and steal information from their session due to insufficient validation of user input in '/add_exclude_dir?sid=', affecting the 'exclude_dir' parameter.

Weakness: CWE-79

Which versions are affected by CVE-2025-59898?

It affects 2 products.

Products include Flexense Diskpulse, Flexense Syncbreeze.

How do I fix CVE-2025-59898?

No fix has been published for CVE-2025-59898 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-2025-59898 being exploited?

There is no known exploitation of CVE-2025-59898 in the wild and no public exploit code.

Sources

Also known as GHSA-45v9-p764-4x3m.