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CVE-2026-123998— Hisense VIDAA Smart TV MQTT Broker Authentication Bypass

Quick assessment

Affected
Hisense VIDAA
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

海信 VIDAA 智能电视固件版本 V0000.01.00a.P0220 在其远程控制的 MQTT 代理（监听 TCP 36669 端口）中存在身份验证绕过漏洞。该代理接受公开文档中记载的默认凭据，并采用无效的 4 位配对 PIN 码，且未实施速率限制或锁定机制，使得攻击者可在约 5 秒内暴力穷举整个 PIN 码空间；此外，部分操作甚至无需配对即可执行。位于同一局域网内的攻击者可利用此漏洞注入按键事件、调节音量、切换输入源、枚举可用输入、启动任意已安装的应用程序，并监控配对活动。在酒店等场景中，由于非受信局域网访问

CVSS 8.3 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
Hisense VIDAA 0000.01.00a.P0220 affected
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I. Basic Information for CVE-2026-123998

Vulnerability Information
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Vulnerability Title
Hisense VIDAA Smart TV MQTT Broker Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1392
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Hisense VIDAA 0000.01.00a.P0220 -

II. Public POCs for CVE-2026-123998

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III. Intelligence Information for CVE-2026-123998

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Other References for CVE-2026-123998 (2)

Same Patch Batch · Hisense · 2026-11-06 · 6 CVEs total

CVE-2026-123993 8.8 HIGH Hisense VIDAA Smart TV Unauthenticated WebDriver Remote Access
CVE-2026-123997 6.5 MEDIUM Hisense VIDAA Smart TV Unauthenticated DoS via SetAVTransportURI
CVE-2026-123994 6.3 MEDIUM Hisense VIDAA Smart TV DIAL Service Unauthenticated Access
CVE-2026-123996 4.6 MEDIUM Hisense VIDAA Smart TV UPnP/DLNA Missing Authentication
CVE-2026-123995 4.6 MEDIUM Hisense VIDAA Smart TV SSRF via SetAVTransportURI CurrentURI

IV. Related Vulnerabilities

Same product: VIDAA
Same vendor: Hisense
Same weakness: CWE-1392