Vulnerability · Published Mar 30, 2026 · Assigned by VulnCheck
CVE-2026-27508Smoothwall Express < 3.1 Update 13 Reflected XSS in redirect.cgi via url Parameter
Medium 5.4
In plain English
A medium-severity cross-site scripting in Express from Smoothwall. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 94.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Smoothwall | Express | 0 – before 3.1 Update 13 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
References
- https://community.smoothwall.org/forum/viewtopic.php?t=45095 vendor-advisory, patch
- https://www.vulncheck.com/advisories/smoothwall-express-reflected-xss-in-redirect-cgi-via-url-parameter third-party-advisory