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CVE-2026-8474— Possible to run a Cross Site Scripting request on the login API available on Stormshield SNS appliances.

Quick assessment

Affected
StormShield StormShield Network Security
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Stormshield Network Security（SNS）是法国Stormshield公司的一款下一代UTM（统一威胁管理）防火墙。 Stormshield Network Security 4.3.0至4.3.41版本、4.8.0至4.8.15版本和5.0.0至5.0.5版本存在安全漏洞，该漏洞源于登录API存在反射型跨站脚本攻击，可能导致受害者机器上执行脚本，包括窃取cookie或其他敏感数据，以及修改页面行为。

CVSS 5.3 · Medium EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 3

VendorProduct Version RangeStatus
StormShield StormShield Network Security 4.3.0≤ 4.3.41 affected
4.8.0≤ 4.8.15 affected
5.0.0≤ 5.0.5 affected
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I. Basic Information for CVE-2026-8474

Vulnerability Information
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Vulnerability Title
Possible to run a Cross Site Scripting request on the login API available on Stormshield SNS appliances.
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Stormshield Network Security 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Stormshield Network Security（SNS）是法国Stormshield公司的一款下一代UTM（统一威胁管理）防火墙。 Stormshield Network Security 4.3.0至4.3.41版本、4.8.0至4.8.15版本和5.0.0至5.0.5版本存在安全漏洞，该漏洞源于登录API存在反射型跨站脚本攻击，可能导致受害者机器上执行脚本，包括窃取cookie或其他敏感数据，以及修改页面行为。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
StormShield StormShield Network Security 4.3.0 ~ 4.3.41 -

II. Public POCs for CVE-2026-8474

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III. Intelligence Information for CVE-2026-8474

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Vendor Advisories for CVE-2026-8474 (1)

IV. Related Vulnerabilities

Same product: StormShield Network Security
Same vendor: StormShield
Same weakness: CWE-79

V. Comments for CVE-2026-8474

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