CVE-2025-59903 Stored Cross-Site Scripting (XSS) in Kubysoft
Attackers can execute malicious scripts in user browsers by uploading unsanitized SVG files, potentially leading to session hijacking or data theft.
- 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-2025-59903?
CVE-2025-59903 is a medium-severity cross-site scripting vulnerability in Kubysoft, published on 16 Feb 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
Stored Cross-Site Scripting (XSS) vulnerability in Kubysoft, where uploaded SVG images are not properly sanitized. This allows attackers to embed malicious scripts within SVG files as visual content, which are then stored on the server and executed in the context of any user accessing the compromised resource.
Weakness: CWE-79
Which versions are affected by CVE-2025-59903?
It affects 1 product.
Products include Kubysoft Kubysoft.
How do I fix CVE-2025-59903?
No fix has been published for CVE-2025-59903 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-2025-59903 being exploited?
There is no known exploitation of CVE-2025-59903 in the wild and no public exploit code.
Other vulnerabilities in Kubysoft
Sources
Also known as GHSA-fvcr-8w5m-c388.