{"api_version":"1","generated_at":"2026-04-23T23:10:49+00:00","cve":"CVE-2021-24153","urls":{"html":"https://cve.report/CVE-2021-24153","api":"https://cve.report/api/cve/CVE-2021-24153.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-24153","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-24153"},"summary":{"title":"CVE-2021-24153","description":"A Stored Cross-Site Scripting vulnerability was discovered in the Yoast SEO WordPress plugin before 3.4.1, which had built-in blacklist filters which were blacklisting Parenthesis as well as several functions such as alert but bypasses were found.","state":"PUBLIC","assigner":"contact@wpscan.com","published_at":"2021-04-05 19:15:00","updated_at":"2021-04-09 19:36:00"},"problem_types":["CWE-79"],"metrics":[],"references":[{"url":"https://wpscan.com/vulnerability/77810044-394d-4314-b9a1-20c7dca726dc","name":"https://wpscan.com/vulnerability/77810044-394d-4314-b9a1-20c7dca726dc","refsource":"CONFIRM","tags":[],"title":"Attention Required! | Cloudflare","mime":"text/html","httpstatus":"403","archivestatus":"404"},{"url":"https://packetstormsecurity.com/files/138192/","name":"https://packetstormsecurity.com/files/138192/","refsource":"MISC","tags":[],"title":"WordPress Yoast SEO Cross Site Scripting ≈ Packet Storm","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://plugins.trac.wordpress.org/changeset/1466243/wordpress-seo","name":"https://plugins.trac.wordpress.org/changeset/1466243/wordpress-seo","refsource":"MISC","tags":[],"title":"Changeset 1466243 for wordpress-seo – WordPress Plugin Repository","mime":"text/html","httpstatus":"403","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-24153","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-24153","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"LEGACY","value":"Hammad Shamsi","lang":""}],"nvd_cpes":[{"cve_year":"2021","cve_id":"24153","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"yoast","cpe5":"yoast_seo","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"wordpress","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ID":"CVE-2021-24153","ASSIGNER":"contact@wpscan.com","STATE":"PUBLIC","TITLE":"Yoast SEO < 3.4.1 - Authenticated Stored Cross-Site Scripting (XSS)"},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","generator":"WPScan CVE Generator","affects":{"vendor":{"vendor_data":[{"vendor_name":"Unknown","product":{"product_data":[{"product_name":"Yoast SEO","version":{"version_data":[{"version_affected":"<","version_name":"3.4.1","version_value":"3.4.1"}]}}]}}]}},"description":{"description_data":[{"lang":"eng","value":"A Stored Cross-Site Scripting vulnerability was discovered in the Yoast SEO WordPress plugin before 3.4.1, which had built-in blacklist filters which were blacklisting Parenthesis as well as several functions such as alert but bypasses were found."}]},"references":{"reference_data":[{"refsource":"CONFIRM","url":"https://wpscan.com/vulnerability/77810044-394d-4314-b9a1-20c7dca726dc","name":"https://wpscan.com/vulnerability/77810044-394d-4314-b9a1-20c7dca726dc"},{"refsource":"MISC","url":"https://plugins.trac.wordpress.org/changeset/1466243/wordpress-seo","name":"https://plugins.trac.wordpress.org/changeset/1466243/wordpress-seo"},{"refsource":"MISC","url":"https://packetstormsecurity.com/files/138192/","name":"https://packetstormsecurity.com/files/138192/"}]},"problemtype":{"problemtype_data":[{"description":[{"value":"CWE-79 Cross-site Scripting (XSS)","lang":"eng"}]}]},"credit":[{"lang":"eng","value":"Hammad Shamsi"}],"source":{"discovery":"UNKNOWN"}},"nvd":{"publishedDate":"2021-04-05 19:15:00","lastModifiedDate":"2021-04-09 19:36:00","problem_types":["CWE-79"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.3,"impactScore":2.7},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:S/C:N/I:P/A:N","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"SINGLE","confidentialityImpact":"NONE","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":3.5},"severity":"LOW","exploitabilityScore":6.8,"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:yoast:yoast_seo:*:*:*:*:*:wordpress:*:*","versionEndExcluding":"3.4.1","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"24153","Ordinal":"198915","Title":"CVE-2021-24153","CVE":"CVE-2021-24153","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"24153","Ordinal":"1","NoteData":"A Stored Cross-Site Scripting vulnerability was discovered in the Yoast SEO WordPress plugin before 3.4.1, which had built-in blacklist filters which were blacklisting Parenthesis as well as several functions such as alert but bypasses were found.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"24153","Ordinal":"2","NoteData":"2021-04-05","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"24153","Ordinal":"3","NoteData":"2021-04-05","Type":"Other","Title":"Modified"}]}}}