{"affected":[{"affectedData":[{"product":"Zettlr","vendor":"Hendrik Erz","versions":[{"status":"affected","version":"from 0.20.0 to 1.8.8"}]}],"source":"vultures@jpcert.or.jp"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:zettlr:zettlr:*:*:*:*:*:*:*:*","matchCriteriaId":"1100DF37-E3EC-4EF7-94C8-7134E5664AB2","versionEndIncluding":"1.8.8","versionStartIncluding":"0.20.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute an arbitrary script by loading a file or code snippet containing an invalid iframe into Zettlr."},{"lang":"es","value":"Una vulnerabilidad de tipo Cross-site scripting en Zettlr desde versión 0.20.0 hasta versiones 1.8.8, permite a un atacante ejecutar una secuencia de comandos arbitraria al cargar un archivo o fragmento de código que contiene un iframe no válido en Zettlr"}],"id":"CVE-2021-20727","lastModified":"2026-06-17T03:34:19.747","metrics":{"cvssMetricV2":[{"acInsufInfo":false,"baseSeverity":"MEDIUM","cvssData":{"accessComplexity":"MEDIUM","accessVector":"NETWORK","authentication":"NONE","availabilityImpact":"NONE","baseScore":4.3,"confidentialityImpact":"NONE","integrityImpact":"PARTIAL","vectorString":"AV:N/AC:M/Au:N/C:N/I:P/A:N","version":"2.0"},"exploitabilityScore":8.6,"impactScore":2.9,"obtainAllPrivilege":false,"obtainOtherPrivilege":false,"obtainUserPrivilege":false,"source":"nvd@nist.gov","type":"Primary","userInteractionRequired":true}],"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"exploitabilityScore":2.8,"impactScore":2.7,"source":"nvd@nist.gov","type":"Primary"}]},"published":"2021-05-27T09:15:07.533","references":[{"source":"vultures@jpcert.or.jp","tags":["Third Party Advisory"],"url":"https://github.com/Zettlr/Zettlr"},{"source":"vultures@jpcert.or.jp","tags":["Third Party Advisory"],"url":"https://jvn.jp/en/jp/JVN98239374/index.html"},{"source":"vultures@jpcert.or.jp","tags":["Product"],"url":"https://www.zettlr.com/"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://github.com/Zettlr/Zettlr"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://jvn.jp/en/jp/JVN98239374/index.html"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Product"],"url":"https://www.zettlr.com/"}],"sourceIdentifier":"vultures@jpcert.or.jp","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-79"}],"source":"nvd@nist.gov","type":"Primary"}]}