CVE-2026-26352

EUVD-2026-17126
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.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 10%
Affected Products (NVD)
VendorProductVersion
smoothwallsmoothwall_express
𝑥
≤ 3.0
smoothwallsmoothwall_express
3.1:update1
smoothwallsmoothwall_express
3.1:update10
smoothwallsmoothwall_express
3.1:update11
smoothwallsmoothwall_express
3.1:update12
smoothwallsmoothwall_express
3.1:update2
smoothwallsmoothwall_express
3.1:update3
smoothwallsmoothwall_express
3.1:update4
smoothwallsmoothwall_express
3.1:update5
smoothwallsmoothwall_express
3.1:update6
smoothwallsmoothwall_express
3.1:update7
smoothwallsmoothwall_express
3.1:update8
smoothwallsmoothwall_express
3.1:update9
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://community.smoothwall.org/forum/viewtopic.php?t=45095
https://www.vulncheck.com/advisories/smoothwall-express-stored-xss-in-vpnmain-cgi-via-vpn-ip-parameter