{"affected":[{"affectedData":[{"product":"Movable Type","vendor":"Six Apart Ltd.","versions":[{"status":"affected","version":"Movable Type 7 r.4903 and earlier (Movable Type 7 Series), Movable Type 6.8.0 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series), Movable Type Premium 1.44 and earlier, and Movable Type Premium Advanced 1.44 and earlier"}]}],"source":"vultures@jpcert.or.jp"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium:*:*:*","matchCriteriaId":"9ED3A1ED-558E-4783-8BCA-47BB68E92D9D","versionEndIncluding":"1.44","vulnerable":true},{"criteria":"cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium_advanced:*:*:*","matchCriteriaId":"69B0E270-7BF7-4B9F-974B-B71B11788D5E","versionEndIncluding":"1.44","vulnerable":true},{"criteria":"cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:*","matchCriteriaId":"7BA76A65-0518-40F0-AE15-4EE416911E27","versionEndIncluding":"6.8.0","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:*","matchCriteriaId":"D37106C9-92CD-44A8-A80B-57754207AE80","versionEndExcluding":"7.8.0","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:*","matchCriteriaId":"5CA5A16F-B42D-4DC7-B9A0-5CA49B05DA7B","versionEndExcluding":"7.8.0","versionStartIncluding":"7.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"Cross-site scripting vulnerability in Edit Boilerplate screen of Movable Type (Movable Type 7 r.4903 and earlier (Movable Type 7 Series), Movable Type 6.8.0 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series), Movable Type Premium 1.44 and earlier, and Movable Type Premium Advanced 1.44 and earlier) allows remote attackers to inject arbitrary script or HTML via unspecified vectors."},{"lang":"es","value":"Una vulnerabilidad de tipo cross-site scripting en la pantalla Edit Boilerplate de Movable Type (Movable Type 7 versiones r.4903 y anteriores (Movable Type 7 Series), Movable Type versiones 6.8.0 y anteriores (Movable Type 6 Series), Movable Type Advanced 7 versiones r.4903 y anteriores (Movable Type Advanced 7 Series), Movable Type Premium versiones 1.44 y anteriores, y Movable Type Premium Advanced versiones 1.44 y anteriores), permite a atacantes remotos inyectar scripts arbitrarios o HTML por medio de vectores no especificados."}],"id":"CVE-2021-20815","lastModified":"2026-06-17T03:34:29.873","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":"2021-08-26T02:15:11.827","references":[{"source":"vultures@jpcert.or.jp","tags":["Third Party Advisory"],"url":"https://jvn.jp/en/jp/JVN97545738/index.html"},{"source":"vultures@jpcert.or.jp","tags":["Release Notes","Vendor Advisory"],"url":"https://movabletype.org/news/2021/08/mt-780-681-released.html"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://jvn.jp/en/jp/JVN97545738/index.html"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Vendor Advisory"],"url":"https://movabletype.org/news/2021/08/mt-780-681-released.html"}],"sourceIdentifier":"vultures@jpcert.or.jp","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-79"}],"source":"nvd@nist.gov","type":"Primary"}]}