CVE-2026-27508

Smoothwall Express < 3.1 Update 13 Reflected XSS in redirect.cgi via url Parameter

State: Published
Severity: 5.1 Medium
Published: Mar 30, 2026
Updated: Jul 28, 2026
Reserved: Feb 19, 2026

Description

Smoothwall Express versions prior to 3.1 Update 13 contain a reflected cross-site scripting vulnerability in the /redirect.cgi endpoint due to improper sanitation of the url parameter. Attackers can craft malicious URLs with javascript: schemes that execute arbitrary JavaScript in victims' browsers when clicked through the unsanitized link.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N	VulnCheck
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N	VulnCheck

Weaknesses

CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')

Affected Products

Product	Versions
ExpressSmoothwall	before 3.1 Update 13Affected

References

https://community.smoothwall.org/forum/viewtopic.php?t=45095vendor-advisorypatch
https://www.vulncheck.com/advisories/smoothwall-express-reflected-xss-in-redirect-cgi-via-url-parameterthird-party-advisory

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