{"affected":[{"defaultStatus":"unaffected","product":"Tapo C520WS v2.6","source":"CNA: TPLink","vendor":"TP-Link Systems Inc.","versions":[{"lessThan":"1.2.4 Build 260326 Rel.24666n","status":"affected","version":"0","versionType":"custom"}]},{"defaultStatus":"unaffected","product":"Tapo C210 v3.6","source":"CNA: TPLink","vendor":"TP Link Systems Inc.","versions":[{"lessThan":"1.2.7 Build 260818 Rel.64715n","status":"affected","version":"0","versionType":"custom"}]}],"cpeConfigurations":[{"negate":false,"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:*","versionEndExcluding":"1.2.4","vulnerable":true}],"negate":false,"operator":"OR"},{"cpeMatch":[{"criteria":"cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:*","vulnerable":false}],"negate":false,"operator":"OR"}],"operator":"AND"}],"cveId":"CVE-2026-34121","cwes":["CWE-287"],"description":"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.\n\nSuccessful exploitation allows unauthenticated execution of restricted configuration actions, which may result in unauthorized modification of device state.","epss":{"date":"2026-11-02","percentile":0.40593,"score":0.00469},"exploits":[],"kev":null,"metrics":[{"score":8.7,"severity":"high","source":"CNA: TPLink","vector":"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","version":"4.0"},{"score":8.7,"severity":"high","source":"NVD: f23511db-6c3e-4e32-a477-6aa17d310630","vector":"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"},{"score":8.8,"severity":"high","source":"NVD: nvd@nist.gov","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}],"modifiedAt":1793657841603,"publishedAt":1775150406705,"references":[{"source":"CNA: TPLink","tags":["patch"],"url":"https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes"},{"source":"CNA: TPLink","tags":["patch"],"url":"https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes"},{"source":"CNA: TPLink","tags":["vendor-advisory"],"url":"https://www.tp-link.com/us/support/faq/5047/"},{"source":"CNA: TPLink","tags":["patch"],"url":"https://www.tp-link.com/us/support/download/tapo-c210/v3.60/#Firmware-Release-Notes"},{"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":[],"url":"https://www.tp-link.com/us/support/download/tapo-c210/v3.60/#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/"}],"remediation":[{"kind":"fix","source":"CNA: TPLink","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes"},{"kind":"fix","source":"CNA: TPLink","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes"},{"kind":"fix","source":"CNA: TPLink","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://www.tp-link.com/us/support/download/tapo-c210/v3.60/#Firmware-Release-Notes"}],"revision":"26734ee303d8d9adde570f6edd9bf8304a0868b236a9af3b39d20aa24b5e12c5","sources":[{"modifiedAt":1793656567205,"name":"CNA: TPLink","retrievedAt":1793657327422,"url":"https://www.cve.org/CVERecord?id=CVE-2026-34121"},{"modifiedAt":1793657841603,"name":"NVD","retrievedAt":1793665131147,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34121"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793657330121,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-34121"}],"ssvc":{"assessedAt":1775152722273,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS and C210","updatedAt":1793665131147}