Vulnerability in Hisense Vidaa
CVE-2026-123998
Hisense VIDAA Smart TV firmware V0000.01.00a.P0220 contains an authentication bypass vulnerability in its remote-control MQTT broker on TCP port 36669, which accepts publicly documented default credentials and an ineffective 4-digit pairing PIN with no rate limiting or lockout, allowing a brute force of the entire code space in about five seconds, while some actions require no pairing at all. A LAN-adjacent attacker can exploit this to inject key events, change volume, switch input sources, enumerate inputs, launch arbitrary installed applications, and monitor pairing activity, posing a significant risk in hotel deployments where untrusted LAN access is common.
Published .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Hisense Vidaa — versions 0000.01.00a.P0220
Weakness classification (CWE)
References
- Researcher Disclosure (technical-description, exploit)
- VulnCheck Advisory: Hisense VIDAA Smart TV MQTT Broker Authentication Bypass (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123998?
- CVE-2026-123998 is a high-severity vulnerability in Hisense Vidaa, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 8.3/10. Published 2026-11-06.
- How severe is CVE-2026-123998?
- High severity. CVSS v3 base score is 8.3 out of 10.