{"id":"CVE-2018-20583","aliases":["EUVD-2022-5057","GHSA-qx76-c53f-5c7q"],"status":"published","title":"PHP League CommonMark vulnerable to Cross-Site Scripting (XSS)","description":"Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1 allows remote attackers to insert unsafe URLs into HTML (even if allow_unsafe_links is false) via a newline character (e.g., writing javascript as javascri%0apt).","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":"2026-11-07","score":0.01863,"percentile":0.79395,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2018-12-30T05:00:00Z","modified":"2026-10-20T10:50:07Z","fixes":[{"ecosystem":"Packagist","package":"league/commonmark","fixed_in":["0.18.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"league/commonmark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.15.6"},{"fixed":"0.18.1"}]}]},{"source":"osv","ecosystem":"Packagist","package":"league/commonmark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.15.6"},{"fixed":"0.18.1"}]}],"versions":["0.15.6","0.15.7","0.16.0","0.17.0","0.17.1","0.17.2","0.17.3","0.17.4","0.17.5","0.18.0"]}],"products":[{"vendor":"thephpleague","product":"commonmark"}],"references":[{"url":"https://commonmark.thephpleague.com/changelog/","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory"]},{"url":"https://github.com/thephpleague/commonmark/issues/337","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://github.com/thephpleague/commonmark/releases/tag/0.18.1","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-20583","tags":["advisory"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/league/commonmark/CVE-2018-20583.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-qx76-c53f-5c7q"},{"url":"https://commonmark.thephpleague.com/changelog","tags":["web"]},{"url":"https://github.com/thephpleague/commonmark","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2018-20583","description":"Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1 allows remote attackers to insert unsafe URLs into HTML (even if allow_unsafe_links is false) via a newline character (e.g., writing javascript as javascri%0apt).","status":"published","published":"2018-12-30T05:00:00Z","modified":"2024-09-16T21:57:28.33Z","updated_at":"2026-11-02T14:35:00.237825Z"}],"euvd":[{"id":"EUVD-2022-5057","description":"Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1 allows remote attackers to insert unsafe URLs into HTML (even if allow_unsafe_links is false) via a newline character (e.g., writing javascript as javascri%0apt).","status":"published","published":"2018-12-30T05:00:00Z","modified":"2024-09-16T21:57:28Z","updated_at":"2026-11-03T00:55:07.221362Z"}],"ghsa":[{"id":"GHSA-qx76-c53f-5c7q","title":"PHP League CommonMark vulnerable to Cross-Site Scripting (XSS)","description":"Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1 allows remote attackers to insert unsafe URLs into HTML (even if allow_unsafe_links is false) via a newline character (e.g., writing javascript as javascri%0apt).","status":"published","published":"2022-05-14T01:40:50Z","modified":"2024-02-06T13:14:23Z","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":"2026-11-02T14:37:36.076201Z"}],"nvd":[{"id":"CVE-2018-20583","description":"Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1 allows remote attackers to insert unsafe URLs into HTML (even if allow_unsafe_links is false) via a newline character (e.g., writing javascript as javascri%0apt).","status":"published","published":"2018-12-30T05:29:00.753Z","modified":"2026-06-17T01:53:07.827Z","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":"2026-11-02T14:04:52.056758Z"}],"osv":[{"id":"CVE-2018-20583","description":"Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1 allows remote attackers to insert unsafe URLs into HTML (even if allow_unsafe_links is false) via a newline character (e.g., writing javascript as javascri%0apt).","status":"published","published":"2018-12-30T05:29:00.753Z","modified":"2026-10-20T10:50:07.634258507Z","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":"2026-11-02T15:44:09.145458Z"},{"id":"GHSA-qx76-c53f-5c7q","title":"PHP League CommonMark vulnerable to Cross-Site Scripting (XSS)","description":"Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1 allows remote attackers to insert unsafe URLs into HTML (even if allow_unsafe_links is false) via a newline character (e.g., writing javascript as javascri%0apt).","status":"published","published":"2022-05-14T01:40:50Z","modified":"2024-02-16T08:16:43.743975Z","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":"2026-11-02T15:46:55.122811Z"}]}}