{"cve":"CVE-2021-21660","nvd":{"published":"2021-05-25T17:15:08.150","modified":"2026-06-17T03:35:57.067","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4},"cwes":["CWE-79"],"references":["http://www.openwall.com/lists/oss-security/2021/05/25/3","https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2198","https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-21660","http://www.openwall.com/lists/oss-security/2021/05/25/3","https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2198"],"products":["jenkins:markdown_formatter"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-21660","score":0.01087,"percentile":0.65311,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-xqpp-26pp-2365","url":"https://osv.dev/vulnerability/GHSA-xqpp-26pp-2365","summary":"XSS vulnerability in Jenkins Markdown Formatter Plugin","modified":"2024-02-16T08:08:05.982027Z","packages":[{"ecosystem":"Maven","name":"io.jenkins.plugins:markdown-formatter","purl":"pkg:maven/io.jenkins.plugins/markdown-formatter","ranges":["<0.2.0"],"fixed":["0.2.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}