Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-27508

Severity CVSS v4.0:
MEDIUM
Type:
CWE-79 Cross-Site Scripting (XSS)
Publication date:
30/03/2026
Last modified:
14/04/2026

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.

Impact

Vector 4.0
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 CVSS v4.0 Severity and Metrics:

Base Score: 5.10 MEDIUM
Vector: 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

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): Active
Confidentiality (VC): None
Integrity (VI): None
Availability (VA): None
Confidentiality (SC): Low
Integrity (SI): Low
Availability (SA): None

Base Score 4.0
5.10
Severity 4.0
MEDIUM
Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.40 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): Low
Availability (A): None

Base Score 3.x
5.40
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:smoothwall:smoothwall_express:*:*:*:*:*:*:*:* 3.0 (including)
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update1:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update10:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update11:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update12:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update2:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update3:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update4:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update5:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update6:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update7:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update8:*:*:-:*:*:*
cpe:2.3:o:smoothwall:smoothwall_express:3.1:update9:*:*:-:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools