CVE-2026-8474
Deferred Deferred - Pending Action
Reflected XSS in Stormshield SNS Appliance

Publication date: 2026-06-01

Last updated on: 2026-06-01

Assigner: Airbus

Description
A vulnerability was discovered on Stormshield Network Security  * 4.3.0 to 4.3.41,  * 4.8.0 to 4.8.15,  * 5.0.0 to 5.0.5 It is possible to execute a reflected XSS attack on the login API available on Stormshield SNS appliance by executing a script on the victim's machine. The risks include the theft of cookies or other sensitive data, as well as the modification of page behavior, for example, by redirecting the victim to malicious websites.
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Meta Information
Published
2026-06-01
Last Modified
2026-06-01
Generated
2026-06-21
AI Q&A
2026-06-01
EPSS Evaluated
2026-06-20
NVD
CVE-2026-8474
EUVD
EUVD-2026-33586
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
stormshield network_security From 4.3.0 (inc) to 4.3.41 (inc)
stormshield network_security From 4.8.0 (inc) to 4.8.15 (inc)
stormshield network_security From 5.0.0 (inc) to 5.0.5 (inc)
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Exploitability
CWE
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KEV
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CWE ID Description
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.
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Executive Summary

This vulnerability is a reflected Cross-Site Scripting (XSS) issue found in the login API of Stormshield Network Security (SNS) appliances. It affects versions 4.3.0 to 4.3.41, 4.8.0 to 4.8.15, and 5.0.0 to 5.0.5. An attacker can execute malicious scripts on a victim's machine by exploiting this vulnerability.

The attack involves injecting a script that is reflected back by the login API, which then runs in the victim's browser. This can lead to theft of cookies or other sensitive data and can modify the behavior of the page, such as redirecting the victim to malicious websites.

Impact Analysis

The impact of this vulnerability includes the potential theft of cookies or other sensitive information from users interacting with the affected Stormshield SNS appliances.

Additionally, the attacker can alter the behavior of the affected web page, for example by redirecting users to malicious websites, which could lead to further compromise or phishing attacks.

The vulnerability has a medium severity rating with a CVSS v3.1 base score of 5.3, indicating a moderate risk level.

Mitigation Strategies

To mitigate this reflected XSS vulnerability in the Stormshield SNS login API, you should apply the official patches provided by Stormshield.

  • Upgrade to SNS version 5.0.6 if you are running 5.0.0 to 5.0.5.
  • Upgrade to SNS version 4.8.16 if you are running 4.8.0 to 4.8.15.
  • Upgrade to SNS version 4.3.42 if you are running 4.3.0 to 4.3.41.

No workaround is available, so applying these patches is the immediate and recommended step to secure your system.

Compliance Impact

The vulnerability allows reflected Cross-Site Scripting (XSS) attacks on the login API of Stormshield SNS appliances, which can lead to theft of cookies or other sensitive data and modification of page behavior.

Such risks could potentially impact compliance with data protection regulations like GDPR or HIPAA, as unauthorized access to sensitive data or session information may violate requirements for data confidentiality and integrity.

However, the provided information does not explicitly state the direct effects on compliance with these standards or regulations.

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