# CVE-2026-86188: AVideo YPTSocket Plugin Unauthenticated Cross-Site Scripting

> Unauthenticated attackers can execute arbitrary JavaScript in victims' browsers via the YPTSocket plugin's websocket callback mechanism in AVideo.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/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:** 8 Sep 2026
- **Also known as:** GHSA-jjf2-9w5j-xm7r, GHSA-xpx7-h2x7-59qq

## What is CVE-2026-86188?

CVE-2026-86188 is a medium-severity cross-site scripting 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

AVideo with YPTSocket plugin enabled contains a cross-site scripting vulnerability allowing unauthenticated attackers to execute arbitrary JavaScript in other users' browsers via the websocket callback mechanism. Attackers can send crafted socket messages with callback names resolving to global functions like avideoConfirmHTML that accept untrusted data and assign it to innerHTML, achieving script execution in the victim's origin without authentication or user interaction.

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

## Which versions are affected by CVE-2026-86188?


## How do I fix CVE-2026-86188?

No fix has been published for CVE-2026-86188 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86188 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86188 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86188 and fix it if it is affected.

What it is: CVE-2026-86188 is a medium-severity cross-site scripting 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86188 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-2026-86188/ (Markdown: https://insights.sbomify.com/CVE-2026-86188/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86188
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86188
- OSV: https://osv.dev/vulnerability/CVE-2026-86188

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86188/
Summaries are generated and may contain mistakes; the official description above is the record.