---
title: "CVE-2026-54458: WWBN AVideo: Unauthenticated Stored DOM Cross-Site Scripting via Per-Client Metadata Broadcast in YPTSocket Plugin"
url: https://erroneo.us/security/cve/CVE-2026-54458/
description: "CVE-2026-54458 (WWBN/AVideo (Composer (PHP))): WWBN AVideo is an open source video platform. Versions prior to 29.0 contain a stored DOM Cross-Site…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-15
date_modified: 2026-07-16
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-54458"
kev: false
cvss: 9.6
epss: 0.00508
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-54458: WWBN AVideo: Unauthenticated Stored DOM Cross-Site Scripting via Per-Client Metadata Broadcast in YPTSocket Plugin

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.5% , percentile 42: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 42% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
- Only applies if your dependency tree includes WWBN/AVideo (Composer (PHP)) <= 29.0, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

WWBN AVideo is an open source video platform. Versions prior to 29.0 contain a stored DOM Cross-Site Scripting vulnerability in the YPTSocket plugin. Any unauthenticated remote attacker can execute arbitrary JavaScript in the authenticated origin of every administrator currently viewing a page that renders the YPTSocket online-users debug panel. plugin/YPTSocket/getWebSocket.json.php issues a signed WebSocket token to any anonymous caller, and MessageSQLiteV2::onOpen at plugin/YPTSocket/MessageSQLiteV2.php lines 91 and 110 reads the attacker-controlled webSocketSelfURI and pagetitle query parameters from the WebSocket connection URL with no validation. Both values persist into the in-memory SQLite connections table and broadcast inside the usersidonline array sent to every connected client; on the client, plugin/YPTSocket/script.js::updateSocketUserCard interpolates the broadcast pagetitle into an HTML template literal that is passed to jQuery $.append(html), which parses attacker bytes into live DOM nodes including with inline event handlers. Successful attackers can can read non-HttpOnly cookies and the CSRF token rendered into the admin dashboard, issue authenticated requests to any admin-only endpoint, exfiltrate the admin dashboard DOM, and chain into any admin-context mutation. When the victim is an AVideo administrator, the attacker turns a single anonymous WebSocket connection into full administrative takeover via the admin's own session. This issue has been patched by https://github.com/WWBN/AVideo/commit/8be71e53ccbe9b84b30870db386fb4d2b11e1c16.

## Affected packages

- Composer (PHP) `WWBN/AVideo` <= 29.0 → fixed: none listed

## Affected products (CVE record)

- WWBN AVideo: <= 29.0

## Severity

- GitHub_M CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L`
- GitHub CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.51% probability of exploitation activity in the next 30 days; percentile 42.

## Sources

- [GitHub Advisory GHSA-8whc-2wmv-ww35](https://github.com/advisories/GHSA-8whc-2wmv-ww35)
- [CVE.org record CVE-2026-54458](https://www.cve.org/CVERecord?id=CVE-2026-54458)
- [NVD entry CVE-2026-54458](https://nvd.nist.gov/vuln/detail/CVE-2026-54458)
- [github.com](https://github.com/WWBN/AVideo/security/advisories/GHSA-8whc-2wmv-ww35)
- [github.com](https://github.com/WWBN/AVideo/commit/8be71e53ccbe9b84b30870db386fb4d2b11e1c16)

---
Source page: https://erroneo.us/security/cve/CVE-2026-54458/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt