Vulnerability-Lookup

CVE-2026-34121 (GCVE-0-2026-34121)

Vulnerability from cvelistv5 – Published: 2026-04-02 17:20 – Updated: 2026-04-02 17:58

Title

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

Summary

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.

Severity

8.7 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-287 - Improper Authentication

Assigner

TPLink

References

3 references

URL	Tags
https://www.tp-link.com/us/support/download/tapo-…	patch
https://www.tp-link.com/en/support/download/tapo-…	patch
https://www.tp-link.com/us/support/faq/5047/	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
TP-Link Systems Inc.	Tapo C520WS v2.6	Affected: 0 , < 1.2.4 Build 260326 Rel.24666n (custom)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-34121

Vulnerability from fkie_nvd - Published: 2026-04-02 18:16 - Updated: 2026-06-17 10:38

Severity

8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
f23511db-6c3e-4e32-a477-6aa17d310630	https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes	Release Notes
f23511db-6c3e-4e32-a477-6aa17d310630	https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes	Release Notes
f23511db-6c3e-4e32-a477-6aa17d310630	https://www.tp-link.com/us/support/faq/5047/	Vendor Advisory

Impacted products

	Vendor	Product	Version
	tp-link	tapo_c520ws_firmware	*
	tp-link	tapo_c520ws	2.6

JSON

To clipboard

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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-34121",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-02T17:58:42.273820Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-02T18:16:28.990",
  "references": [
    {
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes"
    },
    {
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes"
    },
    {
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.tp-link.com/us/support/faq/5047/"
    }
  ],
  "sourceIdentifier": "f23511db-6c3e-4e32-a477-6aa17d310630",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
      "type": "Secondary"
    }
  ]
}

GHSA-WFJ8-P8XG-8J7G

Vulnerability from github – Published: 2026-04-02 18:31 – Updated: 2026-04-06 21:31

Details

Successful exploitation allows unauthenticated execution of restricted configuration actions, which may result in unauthorized modification of device state.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

8.7 (High)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-34121"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-02T18:16:28Z",
    "severity": "HIGH"
  },
  "details": "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.\n\nSuccessful exploitation allows unauthenticated execution of restricted configuration actions, which may result in unauthorized modification of device state.",
  "id": "GHSA-wfj8-p8xg-8j7g",
  "modified": "2026-04-06T21:31:34Z",
  "published": "2026-04-02T18:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34121"
    },
    {
      "type": "WEB",
      "url": "https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes"
    },
    {
      "type": "WEB",
      "url": "https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes"
    },
    {
      "type": "WEB",
      "url": "https://www.tp-link.com/us/support/faq/5047"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-34121 (GCVE-0-2026-34121)

FKIE_CVE-2026-34121

GHSA-WFJ8-P8XG-8J7G

Tags

Sightings

Nomenclature