# CVE-2026-105821: Broken Access Control Leading to Cross-Device Token Issuance in Tapo Cloud MQTT Proxy

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- TP-Link Systems Inc. / Tapo Cloud Service: ≥ 0; < N/A (affected, custom). Source: CNA: TPLink

## Severity and prioritization

- CVSS 4.0: 8.3 (high); 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; source: CNA: TPLink

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.tp-link.com/us/support/faq/5370/ (CNA: TPLink; vendor-advisory)

## Provenance

- CNA: TPLink: https://www.cve.org/CVERecord?id=CVE-2026-105821; retrieved 2026-11-03; source updated 2026-11-03

Revision: 5f7778bdfda0ffb04acb3691dffdca8d6e54ed488c006ff39ade823fdb5f6039

Canonical: https://y2.dev/cve/CVE-2026-105821

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