{"api_version":"1","generated_at":"2026-04-24T18:30:15+00:00","cve":"CVE-2020-6816","urls":{"html":"https://cve.report/CVE-2020-6816","api":"https://cve.report/api/cve/CVE-2020-6816.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-6816","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-6816"},"summary":{"title":"CVE-2020-6816","description":"In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.","state":"PUBLIC","assigner":"security@mozilla.org","published_at":"2020-03-24 22:15:00","updated_at":"2023-11-07 03:25:00"},"problem_types":["CWE-79"],"metrics":[],"references":[{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5/","name":"FEDORA-2020-e0f35d634c","refsource":"FEDORA","tags":[],"title":"[SECURITY] Fedora 33 Update: python-bleach-3.2.1-1.fc33 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://advisory.checkmarx.net/advisory/CX-2020-4277","name":"https://advisory.checkmarx.net/advisory/CX-2020-4277","refsource":"MISC","tags":[],"title":"","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743","name":"https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743","refsource":"MISC","tags":["Third Party Advisory"],"title":"mutation XSS via whitelisted math or svg and RCDATA tag with strip=False · Advisory · mozilla/bleach · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5/","name":"FEDORA-2020-e0f35d634c","refsource":"","tags":[],"title":"[SECURITY] Fedora 33 Update: python-bleach-3.2.1-1.fc33 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach","name":"https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach","refsource":"MISC","tags":["Exploit","Third Party Advisory"],"title":"Mutation Cross-Site Scripting (mXSS) Vulnerabilities Discovered in Mozilla-Bleach","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-6816","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-6816","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2020","cve_id":"6816","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"33","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"6816","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"bleach","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"6816","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"bleach","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2020-6816","qid":"501362","title":"Alpine Linux Security Update for py3-bleach"},{"cve":"CVE-2020-6816","qid":"750269","title":"OpenSUSE Security Update for python-bleach (openSUSE-SU-2021:0552-1)"},{"cve":"CVE-2020-6816","qid":"982824","title":"Python (pip) Security Update for bleach (GHSA-m6xf-fq7q-8743)"}]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2020-6816","ASSIGNER":"security@mozilla.org","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"n/a","product":{"product_data":[{"product_name":"Mozilla Bleach","version":{"version_data":[{"version_value":"<=3.11"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"mutation XSS"}]}]},"references":{"reference_data":[{"refsource":"MISC","name":"https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743","url":"https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743"},{"refsource":"MISC","name":"https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach","url":"https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach"},{"refsource":"FEDORA","name":"FEDORA-2020-e0f35d634c","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5/"},{"refsource":"MISC","name":"https://advisory.checkmarx.net/advisory/CX-2020-4277","url":"https://advisory.checkmarx.net/advisory/CX-2020-4277"}]},"description":{"description_data":[{"lang":"eng","value":"In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False."}]}},"nvd":{"publishedDate":"2020-03-24 22:15:00","lastModifiedDate":"2023-11-07 03:25:00","problem_types":["CWE-79"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":2.7},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:N/I:P/A:N","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":4.3},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*","versionEndExcluding":"3.1.2","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2020","CveId":"6816","Ordinal":"167084","Title":"CVE-2020-6816","CVE":"CVE-2020-6816","Year":"2020"},"notes":[{"CveYear":"2020","CveId":"6816","Ordinal":"1","NoteData":"In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.","Type":"Description","Title":null},{"CveYear":"2020","CveId":"6816","Ordinal":"2","NoteData":"2020-03-24","Type":"Other","Title":"Published"},{"CveYear":"2020","CveId":"6816","Ordinal":"3","NoteData":"2021-03-30","Type":"Other","Title":"Modified"}]}}}