What is CVE-2025-15479?

CVE-2025-15479 is a medium-severity vulnerability in Data Illusion Zumbrunn Ngsurvey, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-01-07.

How severe is CVE-2025-15479?

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

XSS in Data Illusion Zumbrunn Ngsurvey

CVE-2025-15479

Stored cross-site scripting (XSS, CWE-79) in the survey content and administration functionality in Data Illusion Zumbrunn NGSurvey Enterprise Edition 3.6.4 on all supported platforms ( on Windows and Linux servers ) allows authenticated remote users with survey creation or edit privileges to execute arbitrary JavaScript in other users’ browsers, steal session information and perform unauthorized actions on their behalf via crafted survey content that is rendered without proper output encoding.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-01-07 · last modified 2026-09-30.

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.

EPSS exploit prediction

EPSS: 0.002 (8.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Data Illusion Zumbrunn Ngsurvey — versions 3.6.4
Ngsurvey

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

64c5ae8f-7972-4697-86a0-7ada793ac795 (vendor-advisory, Release Notes)
64c5ae8f-7972-4697-86a0-7ada793ac795 (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2025-15479?: CVE-2025-15479 is a medium-severity vulnerability in Data Illusion Zumbrunn Ngsurvey, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-01-07.
How severe is CVE-2025-15479?: Medium severity. CVSS v3 base score is 5.4 out of 10.