CVE-2026-34123

Restricted-account escalation via API method mapping

Published Jun 5, 2026 · Updated Jun 5, 2026

Improper authentication in TP-Link Tapo C520WS v2 before 1.2.6 Build 260528 allows remote authenticated users to execute restricted API operations. The authorization layer accepts crafted method mappings that disguise blocked operations as whitelisted requests. Access to a restricted account and adjacent-network reachability are required; successful requests can reset the device, alter configuration, or interrupt operation.

CVSS severity7.0
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in TP-Link Tapo C520WS v2 before 1.2.6 Build 260528 allows remote authenticated users to execute restricted API operations. The authorization layer accepts crafted method mappings that disguise blocked operations as whitelisted requests. Access to a restricted account and adjacent-network reachability are required; successful requests can reset the device, alter configuration, or interrupt operation.

The record

CVE
CVE-2026-34123
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
TP-Link Systems Inc.
Product
Tapo C520WS
Classifications
CWE-287, T1068
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.2.6 Build 260528

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

TP-Link Systems Inc. · Tapo C520WSversion=0 <1.2.6 Build 260528

Published CVSS scores

7.0TPLinkCVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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