CVE-2026-51691
Low risk· EPSS 7%Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
Incorrect access control in the setUploadSetting function of TOTOLINK T6 allows unauthenticated attackers to manipulate the upload or flash workflow via a crafted POST request to /cgi-bin/cstecgi.cgi.
Risk Assessment
An attacker can manipulate the update process, potentially leading to installation of malicious firmware or device damage.
Recommendation
Update TOTOLINK T6 firmware to a version that fixes access control.
Other vulnerabilities in TOTOLINK T6
See all- CVE-2026-51764Unknown
Incorrect access control in the recvSlaveCloudCheckStatus function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to overwrite cloud-result tracking files via sending a crafted MQTT message to the cs_broker component.
- CVE-2026-51762Unknown
Incorrect access control in the meshInfoKick function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to kick or clean stale mesh information/state and trigger regeneration of mesh metadata via sending a crafted MQTT message to the cs_broker component.
- CVE-2026-51760Unknown
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.
- CVE-2026-51757Unknown
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.
- CVE-2026-51754Unknown
Incorrect access control in the updateSlaveIpList function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to overwrite the slave IP inventory state via sending a crafted MQTT message to the cs_broker component.
- CVE-2026-51751Unknown
Incorrect access control in the delSlaveDevice function of TOTOLINK T6 allows unauthenticated attackers to remove a specified slave device from local mesh management data and reboot the system via a crafted MQTT message to the cs_broker component.
- CVE-2026-51750Unknown
Incorrect access control in the updatePriChannel function of TOTOLINK T6 allows unauthenticated attackers to rescan and switch the primary mesh channel via a crafted MQTT message to the cs_broker component.
- CVE-2026-51747Unknown
Incorrect access control in the keepAlive function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to emit indirect mesh heartbeat information toward the master via sending a crafted MQTT message to the cs_broker component.
- CVE-2026-51744Unknown
Incorrect access control in the recv_mesh_info_sync function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to force mesh configuration synchronization from an attacker-controlled host via sending a crafted MQTT message to the cs_broker component.
- CVE-2026-51741Unknown
Incorrect access control in the clearDiagnosisLog function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to erase diagnosis logs by sending a crafted POST request to /cgi-bin/cstecgi.cgi.
Original NVD description (English source)
Incorrect access control in the setUploadSetting function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to manipulate the upload or flash workflow via sending a crafted POST request to /cgi-bin/cstecgi.cgi.