# 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.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Jun 2026
- **Updated:** 1 Jun 2026
- **Also known as:** GHSA-72g9-78vw-8w8h

## 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 (Improper Neutralization of Input During Web Page Generation)

## 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.

## Is CVE-2026-8474 being exploited?

There is no known exploitation of CVE-2026-8474 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8474 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-8474 in the wild and no public exploit code.

Affected product: StormShield Network Security. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-8474/ (Markdown: https://insights.sbomify.com/CVE-2026-8474/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8474
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8474
- OSV: https://osv.dev/vulnerability/CVE-2026-8474

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-8474/
Summaries are generated and may contain mistakes; the official description above is the record.