CVE-2026-26352

MEDIUM

Smoothwall Express < 3.1 Update 13 Stored XSS in vpnmain.cgi via VPN_IP Parameter

Title source: cna

Description

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 JavaScript through VPN configuration settings that executes when the affected page is viewed by other users.

References (2)

[Vendor Advisory] https://community.smoothwall.org/forum/viewtopic.php?t=45095

[Third Party Advisory] https://www.vulncheck.com/advisories/smoothwall-express-stored-xss-in-vpnmain-cgi-via-vpn-ip-parameter

Scores

CVSS v3 5.4

EPSS 0.0003

EPSS Percentile 8.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Details

CWE

CWE-79

Status published

Products (1)

Smoothwall/Express < 3.1 Update 13

Published Mar 30, 2026

Tracked Since Mar 30, 2026