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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.

PUBLISHED Reserved 2026-02-19 | Published 2026-03-30 | Updated 2026-05-25 | Assigner VulnCheck




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Problem types

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

Product status

Default status
unaffected

Any version before 3.1 Update 13
affected

Credits

Alex Williams from Pellera Technologies finder

VulnCheck coordinator

References

community.smoothwall.org/forum/viewtopic.php?t=45095 vendor-advisory patch

www.vulncheck.com/...d-xss-in-redirect-cgi-via-url-parameter third-party-advisory

cve.org (CVE-2026-27508)

nvd.nist.gov (CVE-2026-27508)

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