Stored XSS on SNS Enrollment Portal

Advisory ID CVE Number Date discovered Severity Advisory revision
STORM-2026-026 CVE-2026-113808 09/04/2026 medium v3

Vulnerability details

A Stored Cross-Site Scripting vulnerability exists in the SNS enrollment Portal.

Impacted products

ProductsSeverityDetail
Stormshield Network Security medium SNS is impacted.

Revisions

Version Date Description
v1 10/16/2026 Initial release
v2 10/20/2026 Advisory disclosure
v3 10/21/2026 Added CVE ID


Stormshield Network Security

CVSS v3.1 Overall Score: 6.4      

Analysis

Impacted version

Through the captive portal an attacker can inject an XSS when requesting user creation. The stored XSS can only be triggered during validation by the administrator.
  • SNS 5.1.0 to 5.1.3
  • SNS 5.0.0 to 5.0.9
  • SNS 4.8.0 to 4.8.19
  • SNS 4.3.0 to 4.3.44

Workaround solution

Solution

There is no workaround solution.

The following updates will fix this vulnerability:

  • SNS 5.1.4 EA
  • SNS 5.0.10
  • SNS 4.8.20 LTSB
  • SNS 4.3.45 QS


Attack Vector Attack Complexity Privileges Required User Interaction Scope Confidentiality Impact Integrity Impact Availability impact
Adjacent Network High None Required Unchanged High High High
CVSS Base score: 7.1 CVSS Vector: (AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
Exploit Code Maturity Remediation Level Report Confidence
Proof of concept code Official fix Confirmed
CVSS Temporal score: 6.4 CVSS Vector: (AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C)
Attack Vector (MAV) Attack Complexity (MAC) Privileges Required (MPR) User Interaction (MUI) Scope (MS)
Adjacent Network High None Required Unchanged
Confidentiality Impact (MC) Integrity Impact (MI) Availability Impact (MA)
High High High
Confidentiality Requirement (CR) Integrity Requirement (IR) Availability Requirement (AR)
High High High
CVSS Environmental score: 6.4 CVSS Vector: (AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C/CR:H/IR:H/AR:H/MAV:A/MAC:H/MPR:N/MUI:R/MS:U/MC:H/MI:H/MA:H)