CVE-2026-34121 json
Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS and C210
published 2026-04-02 7 mo ago modified 2026-11-02 6 d ago also EUVD-2026-18432
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
An authentication bypass vulnerability within the HTTP handling of the DS configuration service in TP-Link Tapo C520WS v2.6 and C210 v3 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.
Patch / fix
- TP-Link Systems Inc. Tapo C520WS v2.6 1.2.4 Build 260326 Rel.24666n
- TP Link Systems Inc. Tapo C210 v3.6 1.2.7 Build 260818 Rel.64715n
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | 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 |
| CNA | 4.0 | 8.7 | 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:X/V:X/RE:X/U:X |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- TP-Link Systems Inc. Tapo C520WS v2.6
- TP Link Systems Inc. Tapo C210 v3.6
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
tp-link.com
/us/support/download/tapo-c520ws/#Firmware-Release-Notes
patch, release-notes
-
tp-link.com
/en/support/download/tapo-c520ws/#Firmware-Release-Notes
patch, release-notes
-
tp-link.com
/us/support/download/tapo-c210/v3.60/#Firmware-Release-Notes
patch
-
tp-link.com
/us/support/faq/5047/
vendor-advisory
Sources
- CVE List CVE-2026-34121
- NVD CVE-2026-34121
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.