{"api_version":"1","generated_at":"2026-04-23T03:06:20+00:00","cve":"CVE-2023-36459","urls":{"html":"https://cve.report/CVE-2023-36459","api":"https://cve.report/api/cve/CVE-2023-36459.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-36459","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-36459"},"summary":{"title":"CVE-2023-36459","description":"Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 1.3 and prior to versions 3.5.9, 4.0.5, and 4.1.3, an attacker using carefully crafted oEmbed data can bypass the HTML sanitization performed by Mastodon and include arbitrary HTML in oEmbed preview cards. This introduces a vector for cross-site scripting (XSS) payloads that can be rendered in the user's browser when a preview card for a malicious link is clicked through. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2023-07-06 19:15:00","updated_at":"2023-07-14 19:33:00"},"problem_types":["CWE-79"],"metrics":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2023/07/06/5","name":"http://www.openwall.com/lists/oss-security/2023/07/06/5","refsource":"MISC","tags":[],"title":"oss-security - CVE-2023-36459: mastodon: XSS through oEmbed preview cards","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/mastodon/mastodon/releases/tag/v4.0.5","name":"https://github.com/mastodon/mastodon/releases/tag/v4.0.5","refsource":"MISC","tags":[],"title":"Release v4.0.5 · mastodon/mastodon · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/mastodon/mastodon/releases/tag/v4.1.3","name":"https://github.com/mastodon/mastodon/releases/tag/v4.1.3","refsource":"MISC","tags":[],"title":"Release v4.1.3 · mastodon/mastodon · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/mastodon/mastodon/releases/tag/v3.5.9","name":"https://github.com/mastodon/mastodon/releases/tag/v3.5.9","refsource":"MISC","tags":[],"title":"Release v3.5.9 · mastodon/mastodon · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-ccm4-vgcc-73hp","name":"https://github.com/mastodon/mastodon/security/advisories/GHSA-ccm4-vgcc-73hp","refsource":"MISC","tags":[],"title":"XSS through oEmbed preview cards · Advisory · mastodon/mastodon · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/mastodon/mastodon/commit/6d8e0fae3e96f3cf4febe03fa7fcf5b95ff761b2","name":"https://github.com/mastodon/mastodon/commit/6d8e0fae3e96f3cf4febe03fa7fcf5b95ff761b2","refsource":"MISC","tags":[],"title":"Merge pull request from GHSA-ccm4-vgcc-73hp · mastodon/mastodon@6d8e0fa · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-36459","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-36459","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2023","cve_id":"36459","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"joinmastodon","cpe5":"mastodon","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"data_version":"4.0","data_type":"CVE","data_format":"MITRE","CVE_data_meta":{"ID":"CVE-2023-36459","ASSIGNER":"security-advisories@github.com","STATE":"PUBLIC"},"description":{"description_data":[{"lang":"eng","value":"Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 1.3 and prior to versions 3.5.9, 4.0.5, and 4.1.3, an attacker using carefully crafted oEmbed data can bypass the HTML sanitization performed by Mastodon and include arbitrary HTML in oEmbed preview cards. This introduces a vector for cross-site scripting (XSS) payloads that can be rendered in the user's browser when a preview card for a malicious link is clicked through. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","cweId":"CWE-79"}]}]},"affects":{"vendor":{"vendor_data":[{"vendor_name":"mastodon","product":{"product_data":[{"product_name":"mastodon","version":{"version_data":[{"version_affected":"=","version_value":">= 1.3, < 3.5.9"},{"version_affected":"=","version_value":">= 4.0.0, < 4.0.5"},{"version_affected":"=","version_value":">= 4.1.0, < 4.1.3"}]}}]}}]}},"references":{"reference_data":[{"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-ccm4-vgcc-73hp","refsource":"MISC","name":"https://github.com/mastodon/mastodon/security/advisories/GHSA-ccm4-vgcc-73hp"},{"url":"https://github.com/mastodon/mastodon/commit/6d8e0fae3e96f3cf4febe03fa7fcf5b95ff761b2","refsource":"MISC","name":"https://github.com/mastodon/mastodon/commit/6d8e0fae3e96f3cf4febe03fa7fcf5b95ff761b2"},{"url":"https://github.com/mastodon/mastodon/releases/tag/v3.5.9","refsource":"MISC","name":"https://github.com/mastodon/mastodon/releases/tag/v3.5.9"},{"url":"https://github.com/mastodon/mastodon/releases/tag/v4.0.5","refsource":"MISC","name":"https://github.com/mastodon/mastodon/releases/tag/v4.0.5"},{"url":"https://github.com/mastodon/mastodon/releases/tag/v4.1.3","refsource":"MISC","name":"https://github.com/mastodon/mastodon/releases/tag/v4.1.3"},{"url":"http://www.openwall.com/lists/oss-security/2023/07/06/5","refsource":"MISC","name":"http://www.openwall.com/lists/oss-security/2023/07/06/5"}]},"source":{"advisory":"GHSA-ccm4-vgcc-73hp","discovery":"UNKNOWN"},"impact":{"cvss":[{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.3,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","version":"3.1"}]}},"nvd":{"publishedDate":"2023-07-06 19:15:00","lastModifiedDate":"2023-07-14 19:33:00","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}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0.0","versionEndExcluding":"4.0.5","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1.0","versionEndExcluding":"4.1.3","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*","versionStartIncluding":"1.3","versionEndExcluding":"3.5.9","cpe_name":[]}]}]}},"legacy_mitre":{"record":null,"notes":[]}}}