# CVE-2026-90543

## Summary

- **CVE ID:** CVE-2026-90543
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-306
- **Published:** Sep 12, 2026
- **Last Modified:** Sep 14, 2026

## Description

WWBN AVideo at commit c3edcc274c389816d434acadac07ee78eaf330c1 and earlier, with the Live plugin enabled, contains a missing authentication vulnerability in plugin/Live/socketMessageLiveOwner.json.php. The script reads the `key` and `msg` parameters from $_REQUEST, resolves the stream owner via LiveTransmition::keyExists, and verifies that the stream owner (not the caller) is an administrator; it performs no User::isLogged() check and enforces no CSRF token. As a result, an unauthenticated remote attacker who knows an administrator's Live stream key can call sendSocketSuccessMessageToUsers_id and deliver arbitrary in-app/socket notification messages to that administrator. The issue was unpatched at the time of publication.

## Affected Products

- WWBN — AVideo (0)

## References

- [CNA](https://github.com/WWBN/AVideo/security/advisories/GHSA-wcg2-x62c-m28x)
- [CNA](https://www.vulncheck.com/advisories/wwbn-avideo-missing-authentication-via-socketmessageliveowner-json-php)
- [CISA-ADP](https://github.com/WWBN/AVideo/security/advisories/GHSA-vr35-39vf-9qp9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.35%
- **EPSS Percentile:** 28.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._