7.7

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2026-49279

CVE-2026-49279: WWBN AVideo: Stored XSS via autoEvalCodeOnHTML Bypass in MessageSQLite WebSocket Handler (CVE-2026-43874 Bypass)

WWBN AVideo is an open source video platform. Versions 29.0 and below contain a Stored XSS vulnerability through the autoEvalCodeOnHTML parameter in the MessageSQLite WebSocket Handler. The MessageSQLite.php handler only strips autoEvalCodeOnHTML from $json['msg'], but msgToResourceId() reads from $msg['json'] with higher priority. An attacker can place the XSS payload in the json key instead of msg, bypassing the sanitization entirely. An authenticated attacker can execute arbitrary JavaScript in any connected user's browser session via the WebSocket messaging system, stealing session cookies and authentication tokens, taking over accounts through session hijacking, and chaining with CSRF to perform admin actions on the victim's behalf, in the default SQLite WebSocket backend configuration. This issue has a patch that has yet to be officially released, see https://github.com/WWBN/AVideo/commit/3e0b3ce2bfa766183ff0ae227439394db57b1a23.

(GitHub Advisory)

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CVE-2026-49279

CVE-2026-49279:

7.7

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
wwbn/avideo	composer	<= 29.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The analysis of the provided security advisory and the associated commit clearly indicates a stored Cross-Site Scripting (XSS) vulnerability in the MessageSQLite.php file of the AVideo platform. The root cause of the vulnerability was an incomplete sanitization mechanism within the onMessage function.

The patch, found in commit 3e0b3ce2bfa766183ff0ae227439394db57b1a23, replaces a shallow unset operation on a specific key ($json['msg']['autoEvalCodeOnHTML']) with a call to a new recursive function, removeAutoEvalCodeOnHTMLRecursive. This change demonstrates that the original implementation was flawed and could be bypassed.

The vulnerable function is identified as MessageSQLite.onMessage because it is the entry point for processing WebSocket messages and is where the inadequate sanitization occurred. An attacker could send a specially crafted WebSocket message with a nested JSON payload containing the autoEvalCodeOnHTML directive, which would not be stripped by the vulnerable version of the code. This would lead to the execution of arbitrary JavaScript in the context of another user's browser session.

Vulnerable functions

MessageSQLite.onMessage

plugin/YPTSocket/MessageSQLite.php

The `onMessage` function in `MessageSQLite.php` was vulnerable to a stored XSS attack. Before the patch, the function only removed the `autoEvalCodeOnHTML` key from the top-level `msg` property of the incoming JSON payload. An attacker could bypass this sanitization by placing the malicious `autoEvalCodeOnHTML` payload within a nested `json` object. The vulnerable code did not recursively check for and remove this key, allowing it to be processed and executed on a victim's client.

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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