What is CVE-2025-59903?

CVE-2025-59903 is a medium-severity vulnerability in Kubysoft, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-02-16.

How severe is CVE-2025-59903?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Kubysoft

CVE-2025-59903

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (3.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Kubysoft — versions All versions

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve-coordination@incibe.es (Third Party Advisory)

Frequently asked questions

What is CVE-2025-59903?: CVE-2025-59903 is a medium-severity vulnerability in Kubysoft, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-02-16.
How severe is CVE-2025-59903?: Medium severity. CVSS v3 base score is 5.4 out of 10.