Medium severity · published Jun 1, 2026
CVE-2026-8474
Possible to run a Cross Site Scripting request on the login API available on Stormshield SNS appliances.
5.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SN
StormShield Network Security · StormShield
4.3.0 through 4.3.41; 4.8.0 through 4.8.15; 5.0.0 through 5.0.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8474
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8474
advisories.stormshield.eu
https://advisories.stormshield.eu/2026-003/
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