CVE-2026-51750
Unauthenticated MQTT allows switching primary mesh channel on TOTOLINK T6.
Is CVE-2026-51750 being exploited?
Not confirmed. CVE-2026-51750 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-51750?
CVE-2026-51750 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-51750?
Not known from our data. No patch reference has been recorded for CVE-2026-51750, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-51750 affect?
CVE-2026-51750 affects TOTOLINK T6 firmware 4.1.5cu.748_B20211015, TOTOLINK devices using cs_broker MQTT component. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-51750?
Isolate affected devices, block MQTT (port 1883), monitor MQTT traffic, apply vendor firmware when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote unauthenticated attacker can send crafted MQTT messages to rescan/switch the router's primary mesh channel, causing network disruption or DoS and potential traffic manipulation.
Immediate action required