CVE-2026-34121 | TP-Link Tapo C520WS 2.6 HTTP improper authentication (EUVD-2026-18432)

VDB-354962 · CVE-2026-34121 · EUVD-2026-18432 TP-LINK TAPO C520WS 2.6 HTTP IMPROPER AUTHENTICATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 8.8 $0-$5k 1.53+ Summaryinfo A vulnerability was found in TP-Link Tapo C520WS 2.6. It has been declared as critical. This vulnerability affects unknown code of the component HTTP Handler. Such manipulation leads to improper authentication. This vulnerability is uniquely identified as CVE-2026-34121. The attack can only be initiated within the local network. No exploit exists. Detailsinfo A vulnerability, which was classified as critical, has been found in TP-Link Tapo C520WS 2.6. Affected by this issue is some unknown processing of the component HTTP Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes: An authentication bypass vulnerability within the HTTP handling of the DS configuration service in TP-Link Tapo C520WS v2.6 was identified, due to inconsistent parsing and authorization logic in JSON requests during authentication check. An unauthenticated attacker can append an authentication-exempt action to a request containing privileged DS do actions, bypassing authorization checks. Successful exploitation allows unauthenticated execution of restricted configuration actions, which may result in unauthorized modification of device state. The advisory is available at tp-link.com. This vulnerability is handled as CVE-2026-34121 since 03/25/2026. The exploitation is known to be easy. Access to the local network is required for this attack to succeed. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/02/2026). There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-18432). Productinfo Vendor TP-Link Name Tapo C520WS Version 2.6 License commercial Website Vendor: https://www.tp-link.com/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 8.8 VulDB Meta Temp Score: 8.8 VulDB Base Score: 8.8 VulDB Temp Score: 8.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Improper authentication CWE: CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Partially Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/25/2026 CVE reserved 04/02/2026 +7 days Advisory disclosed 04/02/2026 +0 days VulDB entry created 04/02/2026 +0 days VulDB entry last update Sourcesinfo Vendor: tp-link.com Advisory: tp-link.com Status: Not defined CVE: CVE-2026-34121 (🔒) GCVE (CVE): GCVE-0-2026-34121 GCVE (VulDB): GCVE-100-354962 EUVD: 🔒 Entryinfo Created: 04/02/2026 19:38 Updated: 04/02/2026 21:15 Changes: 04/02/2026 19:38 (66), 04/02/2026 21:15 (1) Complete: 🔍 Cache ID: 99:4AC:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸