{"id":"CVE-2019-9844","aliases":["EUVD-2019-0428","GHSA-qj3f-9gmq-fwv5"],"status":"published","title":"Cross-Site Scripting in simple-markdown","description":"simple-markdown.js in Khan Academy simple-markdown before 0.4.4 allows XSS via a data: or vbscript: URI.","severity":{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01274,"percentile":0.70093,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2019-03-15T23:00:00Z","modified":"2026-10-20T10:51:43Z","fixes":[{"ecosystem":"npm","package":"simple-markdown","fixed_in":["0.4.4"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"simple-markdown","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.4"}]}]},{"source":"osv","ecosystem":"npm","package":"simple-markdown","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.4.4"}]}]}],"products":[{"vendor":"fedoraproject","product":"fedora"},{"vendor":"khanacademy","product":"simple-markdown"}],"references":[{"url":"https://github.com/Khan/simple-markdown/pull/63","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://www.npmjs.com/package/simple-markdown/v/0.4.4","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KZG2I7VH7WLSEUQ77KYP5CRAVFT2RK2U/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JFLP3KJVSV5VWMNEBRXLGRVYFXOV5KOG/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O5EFW655O3BXZYAPB65XEREXB2DSNSOT/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-9844","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-qj3f-9gmq-fwv5","tags":["advisory"]},{"url":"https://www.npmjs.com/advisories/815","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JFLP3KJVSV5VWMNEBRXLGRVYFXOV5KOG/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KZG2I7VH7WLSEUQ77KYP5CRAVFT2RK2U/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O5EFW655O3BXZYAPB65XEREXB2DSNSOT/"},{"url":"https://github.com/Khan/simple-markdown","tags":["package"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JFLP3KJVSV5VWMNEBRXLGRVYFXOV5KOG","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KZG2I7VH7WLSEUQ77KYP5CRAVFT2RK2U","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O5EFW655O3BXZYAPB65XEREXB2DSNSOT","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2019-9844","description":"simple-markdown.js in Khan Academy simple-markdown before 0.4.4 allows XSS via a data: or vbscript: URI.","status":"published","published":"2019-03-15T23:00:00Z","modified":"2024-08-04T22:01:54.905Z","updated_at":"2026-11-02T14:20:20.397093Z"}],"euvd":[{"id":"EUVD-2019-0428","description":"simple-markdown.js in Khan Academy simple-markdown before 0.4.4 allows XSS via a data: or vbscript: URI.","status":"published","published":"2019-03-15T23:00:00Z","modified":"2024-08-04T22:01:54Z","updated_at":"2026-11-03T03:06:37.634716Z"}],"ghsa":[{"id":"GHSA-qj3f-9gmq-fwv5","title":"Cross-Site Scripting in simple-markdown","description":"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.","status":"published","published":"2019-04-09T19:47:29Z","modified":"2023-01-09T05:03:21Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:36:05.071174Z"}],"nvd":[{"id":"CVE-2019-9844","description":"simple-markdown.js in Khan Academy simple-markdown before 0.4.4 allows XSS via a data: or vbscript: URI.","status":"published","published":"2019-04-09T02:29:02.163Z","modified":"2026-06-17T02:44:42.37Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:05:11.426883Z"}],"osv":[{"id":"CVE-2019-9844","description":"simple-markdown.js in Khan Academy simple-markdown before 0.4.4 allows XSS via a data: or vbscript: URI.","status":"published","published":"2019-04-09T02:29:02.163Z","modified":"2026-10-20T10:51:43.976259428Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:13.492058Z"},{"id":"GHSA-qj3f-9gmq-fwv5","title":"Cross-Site Scripting in simple-markdown","description":"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.","status":"published","published":"2019-04-09T19:47:29Z","modified":"2023-11-08T04:01:48.013439Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:54.760124Z"}]}}