# CVE-2026-50040: Cross-site Scripting in StoneFly Storage Concentrator

> Reflected XSS in StoneFly Storage Concentrator allows attackers to execute scripts in authenticated users' browsers, potentially stealing sessions or performing unauthorized actions.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 30 Jun 2026
- **Updated:** 1 Jul 2026
- **Also known as:** GHSA-8h25-3425-5fgh

## What is CVE-2026-50040?

CVE-2026-50040 is a medium-severity cross-site scripting vulnerability in StoneFly Storage Concentrator, published on 30 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Storage Concentrator (SC & SCVM) is vulnerable to reflected cross-site scripting due to unsanitized content being echoed back in 404 error pages. An attacker can craft a malicious URL that, when visited by an authenticated user, causes arbitrary script content to execute within the victim's browser session in the context of the application. This could be leveraged to steal session cookies, redirect users, or perform unauthorized actions on behalf of the victim.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-50040?


## How do I fix CVE-2026-50040?

No fix has been published for CVE-2026-50040 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-50040 being exploited?

There is no known exploitation of CVE-2026-50040 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-50040 and fix it if it is affected.

What it is: CVE-2026-50040 is a medium-severity cross-site scripting vulnerability in StoneFly Storage Concentrator, published on 30 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-50040 in the wild and no public exploit code.

Affected product: StoneFly Storage Concentrator. 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-2026-50040/ (Markdown: https://insights.sbomify.com/CVE-2026-50040/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-50040
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-50040
- OSV: https://osv.dev/vulnerability/CVE-2026-50040

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-50040/
Summaries are generated and may contain mistakes; the official description above is the record.