CVE-2026-51760: n/a
Description
Incorrect access control in the informSyncUpgfw function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to mass-trigger firmware update activity across mesh slaves via sending a crafted MQTT message to the cs_broker component.
CVSS v3.1
Score 9.8critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper access control in the informSyncUpgfw function of TOTOLINK T6 firmware 4.1.5cu.748_B20211015. An attacker without authentication can send specially crafted MQTT messages to the cs_broker component, causing mass-triggering of firmware updates across mesh slave devices. This can lead to complete compromise of confidentiality, integrity, and availability of the affected devices, as indicated by the CVSS 3.1 base score of 9.8 with vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to initiate mass firmware update processes on mesh slave devices, potentially leading to full compromise of device confidentiality, integrity, and availability. This could disrupt network operations and enable further malicious activities on the affected devices.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict access to MQTT broker components and monitor for suspicious MQTT messages if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-08T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6a96dc3eacd9273b49caddb4
Added to database: 09/01/2026, 14:07:58 UTC
Last enriched: 09/07/2026, 13:36:17 UTC
Last updated: 10/17/2026, 18:48:20 UTC
Views: 83
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