What is CVE-2026-6566?

CVE-2026-6566 is a medium-severity vulnerability in Smub Photo Gallery, Sliders, Proofing And Themes – Nextgen Gallery, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-05-20.

How severe is CVE-2026-6566?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Smub Photo Gallery, Sliders, Proofing And Themes – Nextgen Gallery

CVE-2026-6566

The Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 4.2.0. This is due to insufficient object-level authorization in the i…

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.000 (0.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Smub Photo Gallery, Sliders, Proofing And Themes – Nextgen Gallery — versions 0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

Frequently asked questions

What is CVE-2026-6566?: CVE-2026-6566 is a medium-severity vulnerability in Smub Photo Gallery, Sliders, Proofing And Themes – Nextgen Gallery, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-05-20.
How severe is CVE-2026-6566?: Medium severity. CVSS v3 base score is 4.3 out of 10.