XSS in Supsystic Popup By

CVE-2026-27537

Unauthenticated Cross Site Scripting (XSS) in Popup by Supsystic <= 1.11.2 versions.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.002 (11.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 11.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-27537: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-27537?
CVE-2026-27537 is a medium-severity vulnerability in Supsystic Popup By, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2026-08-13.
How severe is CVE-2026-27537?
Medium severity. CVSS v3 base score is 6.5 out of 10.