---
id: "CVE-2026-116139"
kind: "vulnerability"
aliases: ["CVE-2026-116139"]
title: "WWBN AVideo: stored XSS in comments runs script in viewers' browsers"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "php", "self-hosted", "wwbn-avideo"]
not_affected_if: ["auth-required", "comments-disabled"]
published_at: "2026-10-25T14:16:51+00:00"
first_seen_at: "2026-10-25T14:41:22+00:00"
updated_at: "2026-10-25T14:42:59+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116139", "first_seen_at": "2026-10-25T14:41:22+00:00"}]
---

# WWBN AVideo: stored XSS in comments runs script in viewers' browsers

WWBN AVideo versions 26.0 through 29.3.0 let an authenticated commenter post a comment that starts with an img tag carrying an onerror handler, because the markdown renderer keeps event-handler attributes. The script runs in the browser of anyone who views the comment, under the application's origin.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-10-25T14:41:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116139

## From the sources

WWBN AVideo 26.0 through 29.3.0 contains a stored cross-site scripting vulnerability that allows authenticated commenters to inject JavaScript because markDownToHTML() preserves event-handler attributes in leading HTML blocks. Attackers can post a comment starting with an img tag carrying an onerror handler, which bypasses the inline sanitizer and executes in viewers' browsers under the application origin.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_