# CVE-2026-89243: WWBN AVideo Stored XSS via UserGroups setGroup_name

> Administrators can inject malicious scripts via group names, leading to code execution in other administrators' browsers.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **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-4773-89rr-mp32, GHSA-qm3h-2jrx-xmg6

## What is CVE-2026-89243?

CVE-2026-89243 is a critical cross-site scripting vulnerability in WWBN AVideo, published on 11 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in UserGroups::setGroup_name() that fails to sanitize group_name input. Administrators with canAdminUserGroups permission can inject malicious HTML and JavaScript that executes in the browser when other administrators access the user manager interface.

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

## Which versions are affected by CVE-2026-89243?


## How do I fix CVE-2026-89243?

No fix has been published for CVE-2026-89243 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-89243 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89243 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89243 and fix it if it is affected.

What it is: CVE-2026-89243 is a critical cross-site scripting vulnerability in WWBN AVideo, published on 11 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89243 exists.

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-2026-89243/ (Markdown: https://insights.sbomify.com/CVE-2026-89243/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89243
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89243
- OSV: https://osv.dev/vulnerability/CVE-2026-89243

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89243/
Summaries are generated and may contain mistakes; the official description above is the record.