How severe is CVE-2026-66434?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XSS in Sayontan Sinha Photonic Gallery & Lightbox For Flickr, Smugmug Others

Q: What is CVE-2026-66434?

CVE-2026-66434 is a medium-severity vulnerability in Sayontan Sinha Photonic Gallery & Lightbox For Flickr, Smugmug Others, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2026-07-27.

CVE-2026-66434

Contributor Cross Site Scripting (XSS) in Photonic Gallery & Lightbox for Flickr, SmugMug & Others <= 3.33 versions.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L.

Affected products

Sayontan Sinha Photonic Gallery & Lightbox For Flickr, Smugmug Others — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

audit@patchstack.com (vdb-entry)

Frequently asked questions

What is CVE-2026-66434?: CVE-2026-66434 is a medium-severity vulnerability in Sayontan Sinha Photonic Gallery & Lightbox For Flickr, Smugmug Others, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2026-07-27.
How severe is CVE-2026-66434?: Medium severity. CVSS v3 base score is 6.5 out of 10.