{"affected":[{"affectedData":[{"product":"Jenkins Markdown Formatter Plugin","vendor":"Jenkins project","versions":[{"lessThanOrEqual":"0.1.0","status":"affected","version":"unspecified","versionType":"custom"}]}],"source":"jenkinsci-cert@googlegroups.com"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:jenkins:markdown_formatter:*:*:*:*:*:jenkins:*:*","matchCriteriaId":"310A57FB-5E7F-44A2-B331-AD9919A1EA4E","versionEndIncluding":"0.1.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"Jenkins Markdown Formatter Plugin 0.1.0 and earlier does not sanitize crafted link target URLs, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with the ability to edit any description rendered using the configured markup formatter."},{"lang":"es","value":"Jenkins Markdown Formatter Plugin versiones 0.1.0 y anteriores, no sanean las URL objetivo de enlaces diseñados, resultando en una vulnerabilidad de tipo cross-site scripting (XSS) almacenado explotable por atacantes con la capacidad de editar cualquier descripción renderizada utilizando el formateador de marcado configurado"}],"id":"CVE-2021-21660","lastModified":"2026-06-17T03:35:57.067","metrics":{"cvssMetricV2":[{"acInsufInfo":false,"baseSeverity":"LOW","cvssData":{"accessComplexity":"MEDIUM","accessVector":"NETWORK","authentication":"SINGLE","availabilityImpact":"NONE","baseScore":3.5,"confidentialityImpact":"NONE","integrityImpact":"PARTIAL","vectorString":"AV:N/AC:M/Au:S/C:N/I:P/A:N","version":"2.0"},"exploitabilityScore":6.8,"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":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"exploitabilityScore":2.3,"impactScore":2.7,"source":"nvd@nist.gov","type":"Primary"}]},"published":"2021-05-25T17:15:08.150","references":[{"source":"jenkinsci-cert@googlegroups.com","tags":["Mailing List","Third Party Advisory"],"url":"http://www.openwall.com/lists/oss-security/2021/05/25/3"},{"source":"jenkinsci-cert@googlegroups.com","tags":["Vendor Advisory"],"url":"https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2198"},{"source":"jenkinsci-cert@googlegroups.com","tags":["Third Party Advisory"],"url":"https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-21660"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Mailing List","Third Party Advisory"],"url":"http://www.openwall.com/lists/oss-security/2021/05/25/3"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2198"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-21660"}],"sourceIdentifier":"jenkinsci-cert@googlegroups.com","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-79"}],"source":"nvd@nist.gov","type":"Primary"}]}