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    CVE-2026-51770

    Incorrect access control in the sendToMasterQosConfig function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to forward attacker-controlled QoS settings to the master via sending a crafted MQTT message to the cs_broker component..

    Published:Sep 1, 2026
    Last Modified:Sep 3, 2026
    EPS:Sep 1, 2026
    EPSS Score:0.00442
    CVSS Score:9.8

    Affected Products

    Vendor
    Totolink
    Product
    T6

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
    CAPEC-104 Cross Zone Scripting
    CAPEC-127 Directory Indexing
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-17 Using Malicious Files
    CAPEC-19 Embedding Scripts within Scripts
    CAPEC-39 Manipulating Opaque Client-based Data Tokens
    CAPEC-402 Bypassing ATA Password Security
    CAPEC-441 Malicious Logic Insertion
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-478 Modification of Windows Service Configuration
    CAPEC-479 Malicious Root Certificate
    CAPEC-5 Blue Boxing
    CAPEC-502 Intent Spoof
    CAPEC-503 WebView Exposure
    CAPEC-51 Poison Web Service Registry
    CAPEC-536 Data Injected During Configuration
    CAPEC-546 Incomplete Data Deletion in a Multi-Tenant Environment
    CAPEC-550 Install New Service
    CAPEC-551 Modify Existing Service
    CAPEC-552 Install Rootkit
    CAPEC-556 Replace File Extension Handlers
    CAPEC-558 Replace Trusted Executable
    CAPEC-562 Modify Shared File
    CAPEC-563 Add Malicious File to Shared Webroot
    CAPEC-564 Run Software at Logon
    CAPEC-578 Disable Security Software
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-647 Collect Data from Registries
    CAPEC-668 Key Negotiation of Bluetooth Attack (KNOB)
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-77 Manipulating User-Controlled Variables
    CAPEC-87 Forceful Browsing

    Related CVEs

    CVE-2026-51741 (CVSS 9.8) — Incorrect access control in the clearDiagnosisLog function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthe…
    CVE-2026-51751 (CVSS 9.8) — Incorrect access control in the delSlaveDevice function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenti…
    CVE-2026-51745 (CVSS 5.3) — Incorrect access control in the updatePriStaList function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthen…
    CVE-2026-51744 (CVSS 9.8) — Incorrect access control in the recv_mesh_info_sync function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unaut…
    CVE-2026-51756 (CVSS 5.9) — Incorrect access control in the meshSlaveUpgfw function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenti…
    CVE-2026-51750 (CVSS 9.8) — Incorrect access control in the updatePriChannel function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthen…
    CVE-2026-51752 (CVSS 5.3) — Incorrect access control in the staticInfoSend function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenti…
    CVE-2026-51747 (CVSS 9.8) — Incorrect access control in the keepAlive function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated…
    CVE-2026-51748 (CVSS 5.9) — Incorrect access control in the sendStaticInfoToMaster function of TOTOLINK T6 4.1.5cu.748_B20211015 allows un…
    CVE-2026-51743 (CVSS 9.1) — Incorrect access control in the guest_wifi_sync function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthent…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High