What is CVE-2025-5591?

CVE-2025-5591 is a medium-severity vulnerability in Kentico Xperience, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-01-05.

How severe is CVE-2025-5591?

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

RCE in Kentico Xperience

CVE-2025-5591

Kentico Xperience 13 is vulnerable to a stored cross-site scripting attack via a form component, allowing an attacker to hijack a victim user’s session and perform actions in their security context.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (4.2th 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

Kentico Xperience — versions 13.0.167
Kentico Xperience

Weakness classification (CWE)

CWE-79 — Cross-site Scripting
CWE-1188 — Initialization of a Resource with an Insecure Default

References

vdp@themissinglink.com.au (Third Party Advisory)

Frequently asked questions

What is CVE-2025-5591?: CVE-2025-5591 is a medium-severity vulnerability in Kentico Xperience, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-01-05.
How severe is CVE-2025-5591?: Medium severity. CVSS v3 base score is 5.4 out of 10.