What is CVE-2026-27508?

CVE-2026-27508 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-2026-27508?

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

XSS in Smoothwall Express

CVE-2026-27508

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: sc…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (10.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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-reflected-xss-in-redirect-cgi-v… (third-party-advisory)

Frequently asked questions

What is CVE-2026-27508?: CVE-2026-27508 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-2026-27508?: Medium severity. CVSS v3 base score is 5.4 out of 10.