What is CVE-2026-73378?

CVE-2026-73378 is a high-severity vulnerability in Supsystic Contact Form By, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-08-18.

How severe is CVE-2026-73378?

High severity. CVSS v3 base score is 7.1 out of 10.

XSS in Supsystic Contact Form By

CVE-2026-73378

Unauthenticated Cross Site Scripting (XSS) in Contact Form by Supsystic < 1.10.0 versions.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L.

Affected products

Supsystic Contact Form By

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

audit@patchstack.com (vdb-entry)

Frequently asked questions

What is CVE-2026-73378?: CVE-2026-73378 is a high-severity vulnerability in Supsystic Contact Form By, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-08-18.
How severe is CVE-2026-73378?: High severity. CVSS v3 base score is 7.1 out of 10.