{"affected":[{"affectedData":[{"product":"matrix-react-sdk","vendor":"matrix-org","versions":[{"status":"affected","version":"< 3.15.0"}]}],"source":"security-advisories@github.com"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:matrix-react-sdk_project:matrix-react-sdk:*:*:*:*:*:node.js:*:*","matchCriteriaId":"AFAB6F64-94AF-40C9-9D0F-960483AED3F5","versionEndExcluding":"3.15.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"matrix-react-sdk is an npm package which is a Matrix SDK for React Javascript. In matrix-react-sdk before version 3.15.0, the user content sandbox can be abused to trick users into opening unexpected documents. The content is opened with a `blob` origin that cannot access Matrix user data, so messages and secrets are not at risk. This has been fixed in version 3.15.0."},{"lang":"es","value":"matrix-react-sdk es un paquete npm que es un Matrix SDK para React Javascript.&#xa0;En matrix-react-sdk anterior a la versión 3.15.0, el sandbox del contenido del usuario puede ser abusado para engañar a los usuarios para que abran documentos inesperados.&#xa0;El contenido es abierto con un origen \"blob\" que no puede acceder a los datos del usuario de Matrix, por lo que los mensajes y secretos no están en riesgo.&#xa0;Esto ha sido corregido en la versión 3.15.0"}],"id":"CVE-2021-21320","lastModified":"2026-06-17T03:35:17.443","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":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":2.6,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N","version":"3.1"},"exploitabilityScore":1.2,"impactScore":1.4,"source":"security-advisories@github.com","type":"Secondary"},{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","version":"3.1"},"exploitabilityScore":2.8,"impactScore":1.4,"source":"nvd@nist.gov","type":"Primary"}]},"published":"2021-03-02T03:15:13.213","references":[{"source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"],"url":"https://github.com/matrix-org/matrix-react-sdk/commit/b386f0c73b95ecbb6ea7f8f79c6ff5171a8dedd1"},{"source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"],"url":"https://github.com/matrix-org/matrix-react-sdk/pull/5657"},{"source":"security-advisories@github.com","tags":["Third Party Advisory"],"url":"https://github.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-52mq-6jcv-j79x"},{"source":"security-advisories@github.com","tags":["Product","Third Party Advisory"],"url":"https://www.npmjs.com/package/matrix-react-sdk"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"],"url":"https://github.com/matrix-org/matrix-react-sdk/commit/b386f0c73b95ecbb6ea7f8f79c6ff5171a8dedd1"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"],"url":"https://github.com/matrix-org/matrix-react-sdk/pull/5657"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://github.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-52mq-6jcv-j79x"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Product","Third Party Advisory"],"url":"https://www.npmjs.com/package/matrix-react-sdk"}],"sourceIdentifier":"security-advisories@github.com","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-345"}],"source":"security-advisories@github.com","type":"Secondary"}]}