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Vulnerability record · CVE-2026-34121 · published 2 April 2026

CVE-2026-34121: Tp-link tapo c520ws firmware improper authentication vulnerability

Tp Link · Tapo C520ws Firmware

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.

8.7 CVSS 4.0 High EPSS 0.48% · top 60.9% CWE-287 · Improper authentication
8.7CVSS 4.0 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
24 Jul 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes Release Notes
https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes Release Notes
https://www.tp-link.com/us/support/faq/5047/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.1CVE-2026-8714Tp-link tapo c520ws firmware improper input validation vulnerabilityA denial-of-service vulnerability exists in the RTSP server component of TP-Link Tapo C520WS v2 due to improper handling of syntactically invalid inp…EPSS 0.33%7.1CVE-2026-34122Tp-link tapo c520ws firmware stack-based buffer overflow vulnerabilityA stack-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within a configuration handling component due to insufficient …EPSS 0.36%7.1CVE-2026-34124Tp-link tapo c520ws firmware classic buffer overflow vulnerabilityA denial-of-service vulnerability was identified in TP-Link Tapo C520WS v2.6 within the HTTP request path parsing logic. The implementation enforces …EPSS 0.43%7.1CVE-2026-34118Tp-link tapo c520ws firmware heap-based buffer overflow vulnerabilityA heap-based buffer overflow vulnerability was identified in TP-Link Tapo C100/C101 v5, C520WS v2.6 in the HTTP POST body parsing logic due to missin…EPSS 0.52%7.1CVE-2026-34119Tp-link tapo c520ws firmware heap-based buffer overflow vulnerabilityA heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within the HTTP parsing loop when appending segmented request b…EPSS 0.36%7.1CVE-2026-34120Tp-link tapo c520ws firmware heap-based buffer overflow vulnerabilityA heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within the asynchronous parsing of local video stream content d…EPSS 0.36%7.1CVE-2026-0919Tp-link tapo c220 firmware improper input validation vulnerabilityThe HTTP parser of Tapo C210 v3, C220 v1 and C520WS v2 cameras improperly handles requests containing an excessively long URL path. An invalid‑URL er…EPSS 0.60%7.1CVE-2026-1315Tp-link tapo c220 firmware improper input validation vulnerabilityBy sending crafted files to the firmware update endpoint of Tapo C220 v1 and C520WS v2, the device terminates core system services before verifying a…EPSS 0.64%

Source: NIST National Vulnerability Database (record CVE-2026-34121), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.