CVE-2026-78578: Unauthenticated do Method Onboarding Connect Allows Wi‑Fi Reconfiguration Denial of Service Vulnerability in TP-Link Tapo C120 & C200

Severity: high (CVSS 7.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-01 · updated 2026-10-01
Weakness: CWE-306

Description

Tapo C120 v1 and C200 v5 do not enforce authentication for do method HTTPS onboarding connect actions after initial setup. An unauthenticated adjacent attacker can submit unauthorized wireless configuration parameters, causing the camera to attempt connection to a different network. Successful exploitation disconnects the camera from its intended wireless network, making it unreachable on its management address, resulting in a denial-of-service condition.

Affected products

TP-Link Systems Inc. Tapo C120 v1: before V1_1.9.4 Build 260813 Rel.79754n — fixed in V1_1.9.4 Build 260813 Rel.79754n
TP-Link Systems Inc. Tapo C200 v5: before V5_1.4.6 Build 260709 Rel.27675n — fixed in V5_1.4.6 Build 260709 Rel.27675n

How to fix

Upgrade to a fixed version: TP-Link Systems Inc. Tapo C120 v1 V1_1.9.4 Build 260813 Rel.79754n; TP-Link Systems Inc. Tapo C200 v5 V5_1.4.6 Build 260709 Rel.27675n. Check the vendor advisory for mitigations.

References

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