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TI-2026-26443 Aliases CVE-2026-34121GHSA-wfj8-p8xg-8j7g

Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS and C210

Priority MEDIUM 40CWE-287Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00469 40th percentileScored 2026-11-07
Fix Fixed Tapo C520WS v2.6 (TP-Link Systems Inc.): 1.2.4 Build 260326 Rel.24666nTapo C210 v3.6 (TP Link Systems Inc.): 1.2.7 Build 260818 Rel.64715n

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TP-LinkTapo C520WS v2.6before 1.2.4 Build 260326 Rel.24666n1.2.4 Build 260326 Rel.24666nPatch availableCNA
TP-LinkTapo C210 v3.6before 1.2.7 Build 260818 Rel.64715n1.2.7 Build 260818 Rel.64715nPatch availableCNA
  • Tapo C520WS v2.6 VendorTP-Link Affected before 1.2.4 Build 260326 Rel.24666n Fixed in 1.2.4 Build 260326 Rel.24666n Patch available CNA
  • Tapo C210 v3.6 VendorTP-Link Affected before 1.2.7 Build 260818 Rel.64715n Fixed in 1.2.7 Build 260818 Rel.64715n Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:*before 1.2.4VulnerableTP-Link
cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:*2.6Running onTP-Link
  • cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:* Versions before 1.2.4 Vulnerable ·TP-Link
  • cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:* Versions 2.6 Running on ·TP-Link

Remediation

  • Fix · CNA Tapo C520WS v2.6 (TP-Link Systems Inc.) Fixed in 1.2.4 Build 260326 Rel.24666n
  • Fix · CNA Tapo C210 v3.6 (TP Link Systems Inc.) Fixed in 1.2.7 Build 260818 Rel.64715n

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    TP-Link Systems Tapo C520WS v2.6 — tp-link.com/us/support/faq/5047

    6 records Highest priority Priority MEDIUM 1 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2026-26440 Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in multiple TP-Link Tapo CamerasPriority LOW 32
    • TI-2026-26446 Denial of Service via Path Expansion Overflow in HTTP Service in TP-Link Tapo C520WSPriority LOW 31
    • TI-2026-26444 Stack-based Buffer Overflow Leading to Denial of Service in TP-Link Tapo C520WSPriority LOW 31
    Show all 6 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34121
  2. 2026-10-03 Alias added: GHSA-wfj8-p8xg-8j7g
  3. 2026-11-02 Title updated · CNA
  4. 2026-11-02 Fix available: TP Link Systems Inc./Tapo C210 [email protected] Build 260818 Rel.64715n · CNA
  5. 2026-11-02 1 new reference · CNA

References

Patch 3

Advisory 1

  • TI-2026-26440 Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in multiple TP-Link Tapo Cameras CVSS 4.0HIGH 7.1
  • TI-2026-01028 Unauthenticated Denial of Service via Firmware Update Endpoint on TP-Link Tapo C220 & C520WS CVSS 4.0HIGH 7.1
  • TI-2026-00695 Unauthenticated Denial of Service via Oversized URL in HTTP Parser on TP-Link Tapo C210, C220 & C520WS CVSS 4.0HIGH 7.1
  • TI-2026-00694 Null Pointer Dereference in Tapo SmartCam HTTP Service on TP-Link Tapo C220 & C520WS CVSS 4.0HIGH 7.1
  • TI-2026-26446 Denial of Service via Path Expansion Overflow in HTTP Service in TP-Link Tapo C520WS CVSS 4.0HIGH 7.1
  • TI-2026-26444 Stack-based Buffer Overflow Leading to Denial of Service in TP-Link Tapo C520WS CVSS 4.0HIGH 7.1
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences