CyberSecBulletin
CVE-2026-15315NVD status: Analyzed

Tapo C200 v5: Improper Authentication

Published Updated By the CyberSecBulletin desk

CVE-2026-15315 is a high-severity improper authentication vulnerability in Tapo C200 v5 from TP-Link, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. The record lists version V5_1.4.6 Build 260709 Rel.27675n as the first without the flaw, so updating Tapo C200 v5 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.46% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Tapo C200 v5 to V5_1.4.6 Build 260709 Rel.27675n or a later version.
  2. Update Tapo C120 v1 to 1.9.3 Build 260521 or a later version.
  3. Update Tapo C120 Firmware to 1.9.3 or a later version.
  4. Read the advisory on tp-link.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
TP-LinkTapo C200 v5before V5_1.4.6 Build 260709 Rel.27675nV5_1.4.6 Build 260709 Rel.27675n
TP-LinkTapo C120 v1before 1.9.3 Build 2605211.9.3 Build 260521
TP-LinkTapo C120 Firmwarebefore 1.9.31.9.3
TP-LinkTapo C200 Firmwarebefore 1.4.61.4.6

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
AdjacentThe attacker must be on the same local network segment.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 4.08.7HighCNA
CVSS 3.18.8HighNVD

Official description

Tapo C120 v1 and C200 v5 contain 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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

How developers prevent this class of flaw

  • Use an authentication framework or library such as the OWASP ESAPI Authentication feature.

More Improper Authentication vulnerabilities (CWE-287)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Tapo C200 v5

All Tapo C200 v5 vulnerabilities

Recent Improper Authentication vulnerabilities

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