CVE-2026-15315

Unauthenticated Administrative Authentication Bypass via device_confirm Replay in TP-Link Tapo C120 and C200

HIGH
8.8
CVSS Score
Published: August 18, 2026 at 09:24 PM UTC
Updated: September 4, 2026 at 05:56 PM UTC
4 products affected across 1 vendorTapo C200 FirmwareTapo C120 FirmwareTapo C200

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Severity
HIGH8.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Tapo C200 v5 contains an improper authentication vulnerability within the login authentication verification module. An attacker on the local network can exploit weaknesses in challenge parameter validation to bypass normal authentication controls and obtain administrative session tokens. Successful exploitation may allow an attacker to subsequently execute privileged management actions, enable unauthorized administrative access and temporary disruption of device services, resulting in a denial-of-service (DoS) condition.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.9.3
Affected range stops below 1.9.3, so it looks safe — our inference, not a vendor statement
tp-link-tapo-c120 (same device)
v < 1.4.6
Affected range stops below 1.4.6, so it looks safe — our inference, not a vendor statement
tp-link-tapo-c200 (same device)
v < 1.9.3 Build 260521
Affected range stops below 1.9.3 Build 260521, so it looks safe — our inference, not a vendor statement
v < V5_1.4.6 Build 260709 Rel.27675n
Affected range stops below V5_1.4.6 Build 260709 Rel.27675n, so it looks safe — our inference, not a vendor statement

References (5)

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-287

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