CVE-2025-59449Public exploitNetwork attack vector

Cross-account device control via missing topic authorization

Published Oct 6, 2025 · Updated Oct 6, 2025

Incorrect authorization in YoSmart YoLink MQTT Broker through 2025-10-02 allows remote authenticated users to control other accounts' devices. The broker's internal caching system fails to bind an authenticated MQTT client to the owner of a device-specific publish topic, so it accepts commands targeting another account's predictable device ID. Valid YoLink application MQTT credentials and a target device ID are required; successful commands can unlock locks, open garages, or switch connected plugs.

CVSS severity4.9
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in YoSmart YoLink MQTT Broker through 2025-10-02 allows remote authenticated users to control other accounts' devices. The broker's internal caching system fails to bind an authenticated MQTT client to the owner of a device-specific publish topic, so it accepts commands targeting another account's predictable device ID. Valid YoLink application MQTT credentials and a target device ID are required; successful commands can unlock locks, open garages, or switch connected plugs.

The record

CVE
CVE-2025-59449
Published
Oct 6, 2025
Updated
Oct 6, 2025
Vendor
YoSmart
Product
YoLink MQTT Broker
Classifications
CWE-863, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2025-10-02

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

YoSmart · YoLink MQTT Brokerversion=0 <=2025-10-02

Published CVSS scores

4.9MITRECVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1078Valid Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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