CVE-2025-59449: Auth Bypass (CVSS 4.9)

Description

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.

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CVSS v3.1 Score

4.9

MEDIUM

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

Weakness Type (CWE)

CWE-863 Incorrect Authorization

References

Other References

https://bishopfox.com/blog/advisories https://bishopfox.com/blog/how-a-20-smart-device-gave-me-access-to-your-home https://shop.yosmart.com/pages/product-support https://shop.yosmart.com/pages/sa-2025-001

Frequently Asked Questions

What is CVE-2025-59449? +

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. It has a CVSS v3.1 base score of 4.9 (MEDIUM).

How severe is CVE-2025-59449? +

CVE-2025-59449 has a CVSS v3.1 score of 4.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2025-59449? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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