CVE-2026-51760
Unauthenticated MQTT message can mass-trigger firmware updates on TOTOLINK T6 mesh devices.
Is CVE-2026-51760 being exploited?
Not confirmed. CVE-2026-51760 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-2026-51760?
CVE-2026-51760 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-2026-51760?
Not known from our data. No patch reference has been recorded for CVE-2026-51760, 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-2026-51760 affect?
CVE-2026-51760 affects TOTOLINK T6 (firmware 4.1.5cu.748_B20211015), TOTOLINK mesh slave nodes, cs_broker MQTT component. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-51760?
Block/segment MQTT access, isolate affected devices, and apply vendor firmware when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can send crafted MQTT to cs_broker to mass-trigger firmware updates, causing service disruption, mass reboots, or potential device compromise.
Immediate action required