CVE-2026-34121
highpriority · track · 35EPSS 0.004 · 39 %ileEUUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.3–8.8
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (9)
External citations — patches, advisories, analysis.
- https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notescnnvd
- https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notescnnvd
- https://www.tp-link.com/us/support/faq/5047/cnnvd
- https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notesenisa_euvd
- https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notesenisa_euvd
- https://www.tp-link.com/us/support/faq/5047/enisa_euvd
- https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-NotesRelease Notesnvd
- https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-NotesRelease Notesnvd
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