CVE-2026-8474 Possible to run a Cross Site Scripting request on the login API available on Stormshield SNS appliances.
Attackers can execute reflected XSS on the login API to steal cookies or redirect victims, affecting Stormshield SNS appliances.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8474?
CVE-2026-8474 is a medium-severity cross-site scripting vulnerability in StormShield Network Security, published on 1 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-8474?
How do I fix CVE-2026-8474?
No fix has been published for CVE-2026-8474 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-8474 being exploited?
There is no known exploitation of CVE-2026-8474 in the wild and no public exploit code.
Sources
Also known as GHSA-72g9-78vw-8w8h.