CVE-2026-8474
Reflected XSS in Stormshield SNS Appliance
Publication date: 2026-06-01
Last updated on: 2026-06-01
Assigner: Airbus
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| 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) |
Helpful Resources
Exploitability
| 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. |
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
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.
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
What immediate steps should I take to mitigate this vulnerability?
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.