What is CVE-2025-3662?

CVE-2025-3662 is a medium-severity vulnerability in Colorlib Fancybox, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-06-03.

How severe is CVE-2025-3662?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Colorlib Fancybox

CVE-2025-3662

The FancyBox for WordPress plugin before 3.3.6 does not escape captions and titles attributes before using them to populate galleries' caption fields. The issue was received as a Contributor+ Stored XSS, however one of our researcher (Marc Montpas) escalated it to an Unauthenticated Stored XSS

Vulnerability class: XSS (Cross-Site Scripting)

Published 2025-06-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (15.2th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.2% 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

Colorlib Fancybox
Fancybox For WordPress — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

wpscan.com/vulnerability/4cda12f0-3c23-44ad-80ea-db2443ebcf82/ (Exploit, technical-description, Third Party Advisory, exploit, vdb-entry)

Frequently asked questions

What is CVE-2025-3662?: CVE-2025-3662 is a medium-severity vulnerability in Colorlib Fancybox, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-06-03.
How severe is CVE-2025-3662?: Medium severity. CVSS v3 base score is 6.1 out of 10.