{"id":"CVE-2019-9844","aliases":["GHSA-qj3f-9gmq-fwv5"],"url":"https://o3.security/vulnerability/CVE-2019-9844","summary":"Cross-Site Scripting in simple-markdown","details":"Versions of `simple-markdown` prior to 0.4.4 are vulnerable to Cross-Site Scripting. Due to insufficient input sanitization the package may render output containing malicious JavaScript. This vulnerability can be exploited through input of links containing `data` or VBScript URIs and a base64-encoded payload.\n\n\n## Recommendation\n\nUpgrade to version 0.4.4 or later.","published":"2019-04-09T02:29:02.163Z","modified":"2026-10-20T10:51:43.976259428Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.01509,"percentile":0.72058,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"simple-markdown","fixedVersion":"0.4.4"}],"fix":{"url":"https://github.com/Khan/simple-markdown/pull/63","label":"Khan/simple-markdown#63"},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JFLP3KJVSV5VWMNEBRXLGRVYFXOV5KOG/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KZG2I7VH7WLSEUQ77KYP5CRAVFT2RK2U/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O5EFW655O3BXZYAPB65XEREXB2DSNSOT/"},{"type":"ADVISORY","url":"https://github.com/Khan/simple-markdown/pull/63"},{"type":"ADVISORY","url":"https://www.npmjs.com/package/simple-markdown/v/0.4.4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-9844"},{"type":"PACKAGE","url":"https://github.com/Khan/simple-markdown"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-qj3f-9gmq-fwv5"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JFLP3KJVSV5VWMNEBRXLGRVYFXOV5KOG"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KZG2I7VH7WLSEUQ77KYP5CRAVFT2RK2U"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O5EFW655O3BXZYAPB65XEREXB2DSNSOT"},{"type":"WEB","url":"https://www.npmjs.com/advisories/815"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-20T10:51:43.976259428Z"}}