---
cve: "CVE-2026-34121"
severity: "HIGH"
cvss: 8.7
epss: "45%"
vendor: "TP-Link Systems Inc."
kev: false
exploited: false
published: "2026-04-02 18:16:28"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T07:49:13+02:00"
---

# CVE-2026-34121

> 8.7 HIGH

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Benachbart | warn |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34121) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_