What is CVE-2026-26352?

CVE-2026-26352 is a medium-severity vulnerability in Smoothwall Express, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-30.

How severe is CVE-2026-26352?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Smoothwall Express

CVE-2026-26352

Smoothwall Express versions prior to 3.1 Update 13 contain a stored cross-site scripting vulnerability in the /cgi-bin/vpnmain.cgi script due to improper sanitation of the VPN_IP parameter. Authenticated attackers can inject arbitrary Java…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (10.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Smoothwall Express — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

community.smoothwall.org/forum/viewtopic.php (vendor-advisory, patch)
www.vulncheck.com/advisories/smoothwall-express-stored-xss-in-vpnmain-cgi-via-v… (third-party-advisory)

Frequently asked questions

What is CVE-2026-26352?: CVE-2026-26352 is a medium-severity vulnerability in Smoothwall Express, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-30.
How severe is CVE-2026-26352?: Medium severity. CVSS v3 base score is 5.4 out of 10.