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PatchSiren cyber security CVE debrief

CVE-2026-51744 TOTOLINK CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-09-01T13:19:45.390Z and has not been modified since then. The recv_mesh_info_sync function in TOTOLINK T6 4.1.5cu.748_B20211015 has an incorrect access control vulnerability. This allows unauthenticated attackers to force mesh configuration synchronization by sending a crafted MQTT message to the cs_broker component. The vulnerability has a CVSS score of 9.8 and is considered CRITICAL. Affected product deployments should be reviewed for exposure, and patches or updates provided by the vendor should be applied. Organizations and individuals using TOTOLINK T6 devices, particularly those with exposure to the cs_broker component, should be aware of this vulnerability and take necessary precautions. Operators, platform administrators, and security teams should review the vulnerability and implement compensating controls if patches cannot be applied immediately. Vulnerability management and security teams should prioritize patching and verifying the authenticity of mesh configuration synchronization. Evidence is limited; further verification is needed. The TOTOLINK T6 device is affected, and defenders should verify the authenticity of mesh configuration synchronization and review compensating controls.

Vendor
TOTOLINK
Product
T6
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-01
Original CVE updated
2026-09-03
Advisory published
2026-09-01
Advisory updated
2026-09-03

Who should care

Organizations and individuals using TOTOLINK T6 devices, particularly those with exposure to the cs_broker component, should be aware of this vulnerability and take necessary precautions. Operators, platform administrators, and security teams should review the vulnerability and implement compensating controls if patches cannot be applied immediately. Vulnerability management and security teams should prioritize patching and verifying the authenticity of mesh configuration synchronization.

Technical summary

The recv_mesh_info_sync function in TOTOLINK T6 4.1.5cu.748_B20211015 has an incorrect access control vulnerability. This allows unauthenticated attackers to force mesh configuration synchronization by sending a crafted MQTT message to the cs_broker component. The vulnerability has a CVSS score of 9.8 and is considered CRITICAL. Affected product deployments should be reviewed for exposure, and patches or updates provided by the vendor should be applied.

Defensive priority

Organizations using TOTOLINK T6 devices should prioritize patching and verifying the authenticity of mesh configuration synchronization.

Recommended defensive actions

  • Apply patches or updates provided by the vendor to address the vulnerability.
  • Verify the authenticity of mesh configuration synchronization.
  • Restrict access to the cs_broker component.
  • Monitor network traffic for suspicious MQTT messages.
  • Consider implementing compensating controls, such as network segmentation.

Evidence notes

The CVE description indicates that TOTOLINK T6 4.1.5cu.748_B20211015 has an incorrect access control vulnerability in the recv_mesh_info_sync function, allowing unauthenticated attackers to force mesh configuration synchronization via a crafted MQTT message to the cs_broker component. Evidence is limited; further verification is needed. The TOTOLINK T6 device is affected, and defenders should verify the authenticity of mesh configuration synchronization and review compensating controls.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-51744 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-51744

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-51744 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-51744

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.