{"id":"CVE-2019-20041","aliases":["DEBIAN-CVE-2019-20041","DLA-2067-1","DSA-4599-1","EUVD-2019-10597","GHSA-8j68-mq56-8vpm","UBUNTU-CVE-2019-20041"],"status":"published","title":"wp_kses_bad_protocol in wp-includes/kses.php in WordPress before 5.3.1 mishandles the HTML5 colon...","description":"wp_kses_bad_protocol in wp-includes/kses.php in WordPress before 5.3.1 mishandles the HTML5 colon named entity, allowing attackers to bypass input sanitization, as demonstrated by the javascript\u0026colon; substring.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.04529,"percentile":0.91618,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2019-12-27T07:14:52Z","modified":"2026-10-24T10:50:35Z","fixes":[{"ecosystem":"Debian:12","package":"wordpress","fixed_in":["5.3.2+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"wordpress","fixed_in":["5.3.2+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"wordpress","fixed_in":["5.3.2+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Debian:8","package":"wordpress","fixed_in":["4.1.29+dfsg-0+deb8u1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.2+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.2+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.2+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Debian:8","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.29+dfsg-0+deb8u1"}]}],"versions":["4.1+dfsg-1","4.1+dfsg-1+deb8u1","4.1+dfsg-1+deb8u10","4.1+dfsg-1+deb8u11","4.1+dfsg-1+deb8u12","4.1+dfsg-1+deb8u13","4.1+dfsg-1+deb8u14","4.1+dfsg-1+deb8u15","4.1+dfsg-1+deb8u16","4.1+dfsg-1+deb8u17","4.1+dfsg-1+deb8u18","4.1+dfsg-1+deb8u2","4.1+dfsg-1+deb8u3","4.1+dfsg-1+deb8u4","4.1+dfsg-1+deb8u5","4.1+dfsg-1+deb8u6","4.1+dfsg-1+deb8u7","4.1+dfsg-1+deb8u8","4.1+dfsg-1+deb8u9","4.1.1+dfsg-1","4.1.25+dfsg-1+deb8u1","4.1.26+dfsg-1+deb8u1","4.1.27+dfsg-0+deb8u1","4.1.28+dfsg-0+deb8u1"]},{"source":"osv","ecosystem":"Debian:10","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.4+dfsg1-1+deb10u1"}]}],"versions":["5.0.4+dfsg1-1"],"bundled":18},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3+dfsg-1","4.3.1+dfsg-1","4.4+dfsg-1","4.4.1+dfsg-1","4.4.2+dfsg-1","4.4.2+dfsg-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"wordpress","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.2+dfsg-2","4.8.3+dfsg-1","4.9.1+dfsg-1","4.9.2+dfsg-1","4.9.4+dfsg-1","4.9.5+dfsg1-1"]}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"wordpress","product":"wordpress"}],"references":[{"url":"https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","advisory","report"]},{"url":"https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53","tags":["x_refsource_MISC","x_transferred","Patch","fix","report"]},{"url":"https://seclists.org/bugtraq/2020/Jan/8","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://www.debian.org/security/2020/dsa-4599","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/01/msg00010.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://www.debian.org/security/2020/dsa-4677","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-20041"},{"url":"https://github.com/advisories/GHSA-8j68-mq56-8vpm"},{"url":"https://security-tracker.debian.org/tracker/CVE-2019-20041","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2019-20041","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-20041","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2019-20041","description":"wp_kses_bad_protocol in wp-includes/kses.php in WordPress before 5.3.1 mishandles the HTML5 colon named entity, allowing attackers to bypass input sanitization, as demonstrated by the javascript\u0026colon; 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