Kentico Xperience stored cross-site scripting in multiple-file upload functionality

published 2025-03-24 19 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-8011

cvss: 6.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 60.6%; EPSS 60.6% chance of exploitation in 30 days, percentile 99.1%
public exploits: 0; none known, plus a Nuclei check

The Kentico Xperience application does not fully validate or filter files uploaded via the multiple-file upload functionality, which allows for stored XSS.This issue affects Kentico Xperience through 13.0.178.

Patch / fix

links 1

devnet.kentico.com/download/hotfixes advisory

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 19 mo ago (2025-03-24)

Exploit prediction

60.59% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template Kentico Xperience CMS - Unauthenticated Stored XSS nuclei detection template

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

Kentico Xperience

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation
CWE-434 Unrestricted Upload of File with Dangerous Type

References

devnet.kentico.com /download/hotfixes
vendor-advisory, patch

Sources

CVE List CVE-2025-2748
NVD CVE-2025-2748

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary