What is CVE-2026-66606?

CVE-2026-66606 is a high-severity vulnerability in Themegrill Smartsmtp, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-08-20.

How severe is CVE-2026-66606?

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

XSS in Themegrill Smartsmtp

CVE-2026-66606

Unauthenticated Cross Site Scripting (XSS) in SmartSMTP <= 1.2.0 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

Themegrill Smartsmtp

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

audit@patchstack.com (vdb-entry)

Frequently asked questions

What is CVE-2026-66606?: CVE-2026-66606 is a high-severity vulnerability in Themegrill Smartsmtp, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-08-20.
How severe is CVE-2026-66606?: High severity. CVSS v3 base score is 7.1 out of 10.