FKIE_CVE-2026-34121

Vulnerability from fkie_nvd - Published: 2026-04-02 18:16 - Updated: 2026-04-06 20:24
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
f23511db-6c3e-4e32-a477-6aa17d310630https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-NotesRelease Notes
f23511db-6c3e-4e32-a477-6aa17d310630https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-NotesRelease Notes
f23511db-6c3e-4e32-a477-6aa17d310630https://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
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "710DD89A-E94F-4371-A03F-698C2F61D9C1",
              "versionEndExcluding": "1.2.4",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:*",
              "matchCriteriaId": "72666951-E72F-4494-9A90-1F0B22E2F3CD",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-34121",
  "lastModified": "2026-04-06T20:24:48.170",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "ADJACENT",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
        "type": "Secondary"
      }
    ]
  },
  "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"
    }
  ]
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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