How severe is CVE-2026-3423?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Smub Envira Gallery – Image Photo Gallery, Albums, Video Slideshows & More

CVE-2026-3423

The Envira Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the gallery 'description' configuration field in all versions up to, and including, 1.12.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses a page displaying the gallery with a description enabled.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Smub Envira Gallery – Image Photo Gallery, Albums, Video Slideshows & More

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-3423?: CVE-2026-3423 is a medium-severity vulnerability in Smub Envira Gallery – Image Photo Gallery, Albums, Video Slideshows & More, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-08-28.
How severe is CVE-2026-3423?: Medium severity. CVSS v3 base score is 6.4 out of 10.