CVE-2026-105821

Description

The Tapo Cloud MQTT broker contains a broken access control vulnerability in a proxy topic used by authenticated Tapo devices to request service tokens. The broker does not verify that the device ID supplied in a proxy request belongs to the authenticated device. An attacker who owns a Tapo device and knows another device's ID may obtain a device token scoped to the target device and use it to upload attacker-controlled content to the target user's Tapo Cloud storage. The content may then be presented in the Tapo app as a legitimate event. Successful exploitation may allow an attacker to upload attacker-controlled content that is presented to a target user as a legitimate Tapo event, retrieve internal service information through crafted proxy requests, or abuse Tapo Cloud outbound request capability in activity that could affect service availability.

Overview

State: PUBLISHED
Assigner (CNA): TPLink
CVSS severity: HIGH
CVSS score: 8.3 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Effective score: 8.3 / 10 HIGH source: CNA overview
CWE(s): CWE-862
Reserved: 2026-10-05
Published: 2026-11-03 19:41 UTC
Last updated: 2026-11-03 19:41 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/105xxx/CVE-2026-105821.json
Linked Threat: CVE-2026-105821 — Broken Access Control Leading to Cross-Device Token Issuance in Tapo Cloud MQTT Proxy

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-11-03 20:18:05 UTC
NVD last modified: 2026-11-03 20:18:05 UTC

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-116270
Assigner: TPLink
Published: Nov 3, 2026, 7:41:03 PM
Updated: Nov 3, 2026, 7:41:03 PM
EUVD base score (CVSS 4.0): 8.3 / 10
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
EUVD-reported EPSS: 0.0000
Vendors: TP-Link Systems Inc.
Products: Tapo Cloud Service (0 <N/A)
Aliases: GHSA-w8wf-fr39-3c38

ENISA description: The Tapo Cloud MQTT broker contains a broken access control vulnerability in a proxy topic used by authenticated Tapo devices to request service tokens. The broker does not verify that the device ID supplied in a proxy request belongs to the authenticated device. An attacker who owns a Tapo device and knows another device's ID may obtain a device token scoped to the target device and use it to upload attacker-controlled content to the target user's Tapo Cloud storage. The content may then be presented in the Tapo app as a legitimate event. Successful exploitation may allow an attacker to upload attacker-controlled content that is presented to a target user as a legitimate Tapo event, retrieve internal service information through crafted proxy requests, or abuse Tapo Cloud outbound request capability in activity that could affect service availability.

EUVD references (1)

https://www.tp-link.com/us/support/faq/5370/

Affected products (1)

Vendor	Product	Versions	Platforms
TP-Link Systems Inc.	Tapo Cloud Service	`0` (affected)	—

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://www.tp-link.com/us/support/faq/5370/ vendor-advisory

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (1)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://www.tp-link.com/us/support/faq/5370/ f23511db-6c3e-4e32-a477-6aa17d310630

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Security Advisory - Action Required - Active Exploitation of CVE-2026 ...

web:blog.checkpoint.com

CVE - 2026 -93616 is a newly discovered zero-day vulnerability in Security Management, and a fix is available now as part of this advisory. Fixes are available for both vulnerabilities. Customers running affected versions should install the applicable fixes immediately. Affected versions and remediation instructions are detailed below.

2026-11-04 09:58 UTC
CVE Database Search & Remediation Guidance

web:cvedatabase.com

Search and analyze CVE vulnerabilities with instant access to CVSS scores, affected products, and remediation guidance.

2026-11-04 09:58 UTC
CVE Vulnerabilities 2026: Critical Flaws & Fixes Hub

web:cyberupdates365.com

Track critical CVE vulnerabilities 2026 with verified enterprise patch guides. Fix zero-days across VMware, WordPress, Windows, and cloud infrastructure.

2026-11-04 09:58 UTC
Wednesday, October 21, 2026 Security Releases - Node.js

web:nodejs.org

This is an incomplete fix of CVE - 2026 -21715, which only covered fs.realpathSync.native (). As a result, code running under --permission with restricted --allow-fs-read can still use fs.realpathSync () to check file existence, resolve symlink targets, and enumerate filesystem paths outside of permitted directories.

2026-11-04 09:58 UTC
NVD - Search

web:nvd.nist.gov

Search Please make use of the interactive search interfaces to find information in the database!

2026-11-04 09:58 UTC
Microsoft Patch Tracker (October 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-11-04 09:58 UTC
What Is CVE Remediation in 2026? - aikido.dev

web:www.aikido.dev

None of these is a clean fix , which is why the decision on how to remediate depends on knowing what package versions are running in production and why. This post will cover how AI has accelerated CVE detection and discovery, the upgrade trap, what CVE remediation actually involves in 2026 , and how to solve the CVE remediation problem.

2026-11-04 09:58 UTC
The 8 Best Automated Vulnerability Remediation Tools in 2026

web:www.openhands.dev

Compare 8 automated vulnerability remediation tools for 2026 on fixes, prioritization, integrations, and deployment control.

2026-11-04 09:58 UTC
CVE-2026-105821 | Tenable®

web:www.tenable.com

The Tapo Cloud MQTT broker contains a broken access control vulnerability in a proxy topic used by authenticated Tapo devices to request service tokens. The broker does not verify that the device ID supplied in a proxy request belongs to the authenticated device. An attacker who owns a Tapo device and knows another device's ID may obtain a device token scoped to the target device and use it to ...

2026-11-04 09:58 UTC
Security Advisory: Multiple Vulnerabilities in Tapo C210 (CVE-2026 ...

web:www.tp-link.com

Description of Vulnerabilities and Impact CVE - 2026 -105814: Order-Dependent Authentication Bypass in the DS JSON API TP-Link Tapo C210 V3.60 contains an authentication bypass vulnerability in the DS JSON API. A crafted JSON request containing both a protected operation and public onboarding-related fields may cause module-level authorization checks to be applied inconsistently, allowing ...

2026-11-04 09:58 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-105821.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "MQTT Proxy"
          ],
          "product": "Tapo Cloud Service",
          "vendor": "TP-Link Systems Inc.",
          "versions": [
            {
              "lessThan": "N/A",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "davidsclee (davidleesecurity.co.uk)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "<p>The Tapo\nCloud MQTT broker contains a broken access control vulnerability in a proxy\ntopic used by authenticated Tapo devices to request service tokens. The broker\ndoes not verify that the device ID supplied in a proxy request belongs to the\nauthenticated device. An attacker who owns a Tapo device and knows another\ndevice's ID may obtain a device token scoped to the target device and use it to\nupload attacker-controlled content to the target user's Tapo Cloud storage. The\ncontent may then be presented in the Tapo app as a legitimate event.</p>\n\n<p>Successful\nexploitation may allow an attacker to upload attacker-controlled content that\nis presented to a target user as a legitimate Tapo event, retrieve internal\nservice information through crafted proxy requests, or abuse Tapo Cloud\noutbound request capability in activity that could affect service\navailability.&nbsp;</p>"
            }
          ],
          "value": "The Tapo\nCloud MQTT broker contains a broken access control vulnerability in a proxy\ntopic used by authenticated Tapo devices to request service tokens. The broker\ndoes not verify that the device ID supplied in a proxy request belongs to the\nauthenticated device. An attacker who owns a Tapo device and knows another\ndevice's ID may obtain a device token scoped to the target device and use it to\nupload attacker-controlled content to the target user's Tapo Cloud storage. The\ncontent may then be presented in the Tapo app as a legitimate event.\n\n\n\n\n\nSuccessful\nexploitation may allow an attacker to upload attacker-controlled content that\nis presented to a target user as a legitimate Tapo event, retrieve internal\nservice information through crafted proxy requests, or abuse Tapo Cloud\noutbound request capability in activity that could affect service\navailability."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-1",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs"
            }
          ]
        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862 Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-03T19:41:03.841Z",
        "orgId": "f23511db-6c3e-4e32-a477-6aa17d310630",
        "shortName": "TPLink"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.tp-link.com/us/support/faq/5370/"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Broken Access Control Leading to Cross-Device Token Issuance in Tapo Cloud MQTT Proxy",
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    "datePublished": "2026-11-03T19:41:03.841Z",
    "dateReserved": "2026-10-05T21:36:14.670Z",
    "dateUpdated": "2026-11-03T19:41:03.841Z",
    "state": "PUBLISHED"
  },
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}