{"id":"CVE-2018-1000874","aliases":["EUVD-2018-2051","GHSA-gvg5-fmh4-q8jg"],"status":"disputed","title":"** DISPUTED ** PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting...","description":"PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting (XSS) vulnerability in all distributed parsers allowing a malicious crafted script to be executed that can result in the lose of user data and sensitive user information. This attack can be exploited by crafting a three backtick wrapped payload with a character in front: L: \"```\u003cscript\u003ealert();\u003c/script\u003e```\". NOTE: This has been argued as a non-issue (see references) since it is not the parser's job to sanitize malicious code from a parsed document","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":"2026-11-10","score":0.00799,"percentile":0.5688,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2018-12-20T17:00:00Z","modified":"2026-10-20T10:49:40Z","products":[{"vendor":"cebe","product":"markdown"}],"references":[{"url":"https://github.com/cebe/markdown/issues/166","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report"]},{"url":"https://github.com/cebe/markdown/issues/166#issuecomment-508230493","tags":["x_refsource_MISC","x_transferred","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-1000874"},{"url":"https://github.com/advisories/GHSA-gvg5-fmh4-q8jg"}],"sources":{"cve":[{"id":"CVE-2018-1000874","description":"PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting (XSS) vulnerability in all distributed parsers allowing a malicious crafted script to be executed that can result in the lose of user data and sensitive user information. This attack can be exploited by crafting a three backtick wrapped payload with a character in front: L: \"```\u003cscript\u003ealert();\u003c/script\u003e```\". NOTE: This has been argued as a non-issue (see references) since it is not the parser's job to sanitize malicious code from a parsed document","status":"disputed","published":"2018-12-20T17:00:00Z","modified":"2025-05-06T14:40:27.578Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:35:10.685174Z"}],"euvd":[{"id":"EUVD-2018-2051","description":"PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting (XSS) vulnerability in all distributed parsers allowing a malicious crafted script to be executed that can result in the lose of user data and sensitive user information. This attack can be exploited by crafting a three backtick wrapped payload with a character in front: L: \"```\u003cscript\u003ealert();\u003c/script\u003e```\". NOTE: This has been argued as a non-issue (see references) since it is not the parser's job to sanitize malicious code from a parsed document","status":"published","published":"2018-12-20T17:00:00Z","modified":"2025-05-06T14:40:27Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:32:54.858112Z"}],"ghsa":[{"id":"GHSA-gvg5-fmh4-q8jg","title":"** DISPUTED ** PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting...","description":"** DISPUTED ** PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting (XSS) vulnerability in all distributed parsers allowing a malicious crafted script to be executed that can result in the lose of user data and sensitive user information. This attack can be exploited by crafting a three backtick wrapped payload with a character in front: L: \"```\u003cscript\u003ealert();\u003c/script\u003e```\". NOTE: This has been argued as a non-issue (see references) since it is not the parser's job to sanitize malicious code from a parsed document.","status":"published","published":"2022-05-14T00:56:55Z","modified":"2023-02-02T05:02:54Z","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":"2026-11-02T14:51:31.853894Z"}],"nvd":[{"id":"CVE-2018-1000874","description":"PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting (XSS) vulnerability in all distributed parsers allowing a malicious crafted script to be executed that can result in the lose of user data and sensitive user information. This attack can be exploited by crafting a three backtick wrapped payload with a character in front: L: \"```\u003cscript\u003ealert();\u003c/script\u003e```\". NOTE: This has been argued as a non-issue (see references) since it is not the parser's job to sanitize malicious code from a parsed document","status":"disputed","published":"2018-12-20T17:29:00.957Z","modified":"2026-06-17T01:33:13.763Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"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":"2026-11-02T14:04:50.99633Z"}],"osv":[{"id":"CVE-2018-1000874","description":"PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting (XSS) vulnerability in all distributed parsers allowing a malicious crafted script to be executed that can result in the lose of user data and sensitive user information. This attack can be exploited by crafting a three backtick wrapped payload with a character in front: L: \"```\u003cscript\u003ealert();\u003c/script\u003e```\". NOTE: This has been argued as a non-issue (see references) since it is not the parser's job to sanitize malicious code from a parsed document","status":"published","published":"2018-12-20T17:29:00.957Z","modified":"2026-10-20T10:49:40.719103907Z","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":"2026-11-02T15:44:07.641418Z"}]}}