Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Tp-Link | Tapo C520Ws Firmware | < 1.2.4 |
| Tp-Link | Tapo C520Ws | 2.6 |
Related Weaknesses (CWE)
References
- https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-NotesRelease Notes
- https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-NotesRelease Notes
- https://www.tp-link.com/us/support/faq/5047/Vendor Advisory
FAQ
What is CVE-2026-34121?
CVE-2026-34121 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 ...
How severe is CVE-2026-34121?
CVE-2026-34121 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34121?
Check the references section above for vendor advisories and patch information. Affected products include: Tp-Link Tapo C520Ws Firmware, Tp-Link Tapo C520Ws.