{"affected":[{"affectedData":[{"product":"Jenkins","vendor":"Jenkins project","versions":[{"lessThanOrEqual":"2.274","status":"affected","version":"unspecified","versionType":"custom"},{"lessThanOrEqual":"LTS 2.263.1","status":"affected","version":"unspecified","versionType":"custom"}]}],"source":"jenkinsci-cert@googlegroups.com"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*","matchCriteriaId":"1D0A8DA2-6151-430D-9FC2-1332E25B4E3B","versionEndIncluding":"2.263.1","vulnerable":true},{"criteria":"cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*","matchCriteriaId":"9A6F1AB1-BFB3-448F-BDAC-2A3487CBFEB6","versionEndIncluding":"2.274","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not implement any restrictions for the URL rendering a formatted preview of markup passed as a query parameter, resulting in a reflected cross-site scripting (XSS) vulnerability if the configured markup formatter does not prohibit unsafe elements (JavaScript) in markup."},{"lang":"es","value":"Jenkins versiones 2.274 y anteriores, LTS versiones 2.263.1 y anteriores, no implementan ninguna restricción para la URL que presenta una vista previa formateada del marcado pasado como un parámetro de consulta, resultando en una vulnerabilidad de tipo cross-site scripting (XSS) reflejada si el formateador de marcado configurado no prohíbe elementos no seguros (JavaScript) en el marcado."}],"id":"CVE-2021-21610","lastModified":"2026-06-17T03:35:52.140","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":"2021-01-13T16:15:14.007","references":[{"source":"jenkinsci-cert@googlegroups.com","tags":["Vendor Advisory"],"url":"https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2153"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2153"}],"sourceIdentifier":"jenkinsci-cert@googlegroups.com","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-79"}],"source":"nvd@nist.gov","type":"Primary"}]}