{"id":"CVE-2018-20859","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-20859","generatedAt":"2026-10-28T20:26:15.496Z","title":"edx-platform before 2018-07-18 allows XSS via a response to a Chemical Equation advanced problem.","description":"edx-platform before 2018-07-18 allows XSS via a response to a Chemical Equation advanced problem.","published":"2019-07-30T19:15:13.000Z","lastModified":"2026-06-17T01:53:37.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["edx/edx-platform"],"epss":{"score":0.01202,"percentile":0.68064,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (1.20%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/edx/edx-platform/commit/5b144559fbdba7ff673cc1c165aa2d343e07b6bd.patch","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://groups.google.com/forum/#%21topic/openedx-announce/wsm5mtUhhME","source":"cve@mitre.org"},{"url":"https://patch-diff.githubusercontent.com/raw/edx/edx-platform/pull/18639.patch","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/edx/edx-platform/commit/5b144559fbdba7ff673cc1c165aa2d343e07b6bd.patch","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://groups.google.com/forum/#%21topic/openedx-announce/wsm5mtUhhME","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://patch-diff.githubusercontent.com/raw/edx/edx-platform/pull/18639.patch","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-20859","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}