# CVE-2026-86189: WWBN AVideo Unauthenticated Path Traversal via notify.ffmpeg.json.php

> Unauthenticated attackers can write arbitrary files to the server via path traversal in notify.ffmpeg.json.php, potentially leading to remote code execution.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** GHSA-cprx-fggj-7vpq, GHSA-w6w9-fw29-2x88

## What is CVE-2026-86189?

CVE-2026-86189 is a critical path traversal vulnerability in WWBN AVideo, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

WWBN AVideo contains a path traversal vulnerability in notify.ffmpeg.json.php that allows unauthenticated attackers to write files to arbitrary locations by supplying a caller-chosen path in the avideoRelativePath parameter. Attackers can replay any previously issued ciphertext as a notifyCode token, which is decrypted but never validated, to bypass authentication and write files to the application root and subdirectories.

Weakness: CWE-73 (External Control of File Name or Path)

## Which versions are affected by CVE-2026-86189?


## How do I fix CVE-2026-86189?

No fix has been published for CVE-2026-86189 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86189 being exploited?

There is no known exploitation of CVE-2026-86189 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86189 and fix it if it is affected.

What it is: CVE-2026-86189 is a critical path traversal vulnerability in WWBN AVideo, published on 5 Sep 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-2026-86189 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-2026-86189/ (Markdown: https://insights.sbomify.com/CVE-2026-86189/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86189
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86189
- OSV: https://osv.dev/vulnerability/CVE-2026-86189

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86189/
Summaries are generated and may contain mistakes; the official description above is the record.