# CVE-2026-89254: AVideo CustomizeUser Stored XSS via field_name Parameter

> Administrators can inject malicious scripts via the field_name parameter in the CustomizeUser plugin, leading to stored XSS execution on user profiles.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 11 Sep 2026
- **Updated:** 11 Sep 2026
- **Also known as:** GHSA-7hj4-f9x4-gg7p, GHSA-8cc3-9p8w-vg36

## What is CVE-2026-89254?

CVE-2026-89254 is a critical cross-site scripting vulnerability in WWBN AVideo, published on 11 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the CustomizeUser plugin where the field_name parameter is stored raw without sanitization. Administrators can inject malicious scripts via the add.json.php endpoint that execute when viewing extra info pages or profile forms that render the typeToHTML function.

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

## Which versions are affected by CVE-2026-89254?


## How do I fix CVE-2026-89254?

No fix has been published for CVE-2026-89254 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-89254 being exploited?

There is no known exploitation of CVE-2026-89254 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89254 and fix it if it is affected.

What it is: CVE-2026-89254 is a critical cross-site scripting vulnerability in WWBN AVideo, published on 11 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-89254 in the wild and no public exploit code.

Affected product: WWBN AVideo. 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-2026-89254/ (Markdown: https://insights.sbomify.com/CVE-2026-89254/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89254
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89254
- OSV: https://osv.dev/vulnerability/CVE-2026-89254

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89254/
Summaries are generated and may contain mistakes; the official description above is the record.