CVE-2026-51757
Critical
Description
Incorrect access control in the meshSlaveUpdate function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to start a firmware download or flash workflow on the slave device via sending a crafted MQTT message to the cs_broker component.
SeverityCritical
CVSS9.8
Exploit probability—
ProductT6
PublishedSep 1, 2026
First seenSep 1, 2026
Weakness typeCWE-284Improper access control
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| TOTOLINK T6 | 4.1.5cu.748_B20211015 | — |
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