Smoothwall Express up to 3.1 Update 12 Parameter /redirect.cgi url cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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4.7$0-$5k2.86

Summaryinfo

A vulnerability, which was classified as problematic, was found in Smoothwall Express up to 3.1 Update 12. Impacted is an unknown function of the file /redirect.cgi of the component Parameter Handler. The manipulation of the argument url results in cross site scripting. This vulnerability is identified as CVE-2026-27508. The attack can be executed remotely. There is not any exploit available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Smoothwall Express up to 3.1 Update 12. Affected is some unknown functionality of the file /redirect.cgi of the component Parameter Handler. The manipulation of the argument url with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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.

The weakness was released by Alex Williams. The advisory is shared for download at community.smoothwall.org. This vulnerability is traded as CVE-2026-27508 since 02/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Applying the patch 3.1 Update 13 is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-17127). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.4
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 3.1 Update 13

Timelineinfo

02/19/2026 CVE reserved
03/30/2026 +38 days Advisory disclosed
03/30/2026 +0 days VulDB entry created
03/30/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: community.smoothwall.org
Researcher: Alex Williams
Status: Confirmed

CVE: CVE-2026-27508 (🔒)
GCVE (CVE): GCVE-0-2026-27508
GCVE (VulDB): GCVE-100-354216
EUVD: 🔒

Entryinfo

Created: 03/30/2026 19:44
Updated: 03/30/2026 20:18
Changes: 03/30/2026 19:44 (79), 03/30/2026 20:18 (1)
Complete: 🔍
Cache ID: 216:BE7:103

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