{"id":"CVE-2021-21660","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-21660","generatedAt":"2026-10-27T20:21:17.456Z","title":"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…","description":"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.","published":"2021-05-25T17:15:08.000Z","lastModified":"2026-06-17T03:35:57.000Z","status":"Modified","sourceIdentifier":"jenkinsci-cert@googlegroups.com","cvss":{"version":"3.1","score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["jenkins/markdown formatter"],"epss":{"score":0.01087,"percentile":0.65073,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (1.09%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2021/05/25/3","tags":["Mailing List","Third Party Advisory"],"source":"jenkinsci-cert@googlegroups.com"},{"url":"https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2198","tags":["Vendor Advisory"],"source":"jenkinsci-cert@googlegroups.com"},{"url":"https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-21660","tags":["Third Party Advisory"],"source":"jenkinsci-cert@googlegroups.com"},{"url":"http://www.openwall.com/lists/oss-security/2021/05/25/3","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2198","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-21660","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-21660","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}