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TI-2025-36994 Aliases CVE-2025-59449GHSA-mrg6-25pv-x3g8

Incorrect authorization in YoSmart YoLink MQTT broker

Priority LOW 22CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

The YoSmart YoLink MQTT broker through 2025-10-02 does not enforce sufficient authorization controls to prevent cross-account attacks, allowing an attacker to remotely operate affected devices if the attacker obtains the associated device IDs. Because YoLink device IDs are predictable, an attacker can exploit this to gain full control over any other YoLink user's devices.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00287 21st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
YoSmartYoLink MQTT brokerup to 2025-10-02—No fix listedCNA
  • YoLink MQTT broker VendorYoSmart Affected up to 2025-10-02 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-59449
  2. 2026-10-03 Alias added: GHSA-mrg6-25pv-x3g8

References

Other 4

  • TI-2025-36997 The YoSmart YoLink API through 2025-10-02 uses an endpoint URL that is derived from a… CVSS 3.1MEDIUM 5.8
  • TI-2025-36993 Cleartext transmission of sensitive information in YoSmart YoLink ecosystem CVSS 3.1MEDIUM 4.7
  • TI-2025-36995 Cleartext storage of sensitive information in YoSmart YoLink Smart Hub CVSS 3.1MEDIUM 4.3
  • TI-2025-36996 The YoSmart YoLink application through 2025-10-02 has session tokens with unexpectedly long lifetimes. CVSS 3.1LOW 3.5
  • TI-2025-36992 The YoSmart YoLink Smart Hub device 0382 exposes a UART debug interface. CVSS 3.1LOW 2.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences