{"id":"CVE-2021-36788","aliases":["EUVD-2021-1947","GHSA-28w5-j8xj-2xwc"],"status":"published","title":"Cross-site Scripting in the yoast_seo TYPO3 extension","description":"The yoast_seo (aka Yoast SEO) extension before 7.2.3 for TYPO3 allows XSS.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00471,"percentile":0.40973,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2021-08-13T16:09:42Z","modified":"2026-06-17T03:59:25Z","fixes":[{"ecosystem":"Packagist","package":"yoast-seo-for-typo3/yoast_seo","fixed_in":["7.2.3"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"yoast-seo-for-typo3/yoast_seo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.2.3"}]}]},{"source":"osv","ecosystem":"Packagist","package":"yoast-seo-for-typo3/yoast_seo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.2.3"}]}],"versions":["7.1.0","7.1.1","7.1.2","7.1.3","7.2.0","7.2.1","7.2.2","v1.0","v1.0-beta","v1.0-rc","v1.0.1","v1.1.0","v1.1.1","v1.1.2","v1.2.0","v1.2.1","v1.2.2","v1.2.3","v1.3.0","v1.4.0","v1.4.1","v2.0.0","v2.0.1","v2.0.2","v2.1.0","v3.0.0","v3.0.1","v3.0.2","v3.0.3","v3.0.4","v3.0.5","v4.0.0","v4.1.0","v5.0.0","v5.0.1","v5.1.0","v5.1.1","v6.0.0","v6.0.1","v7.0.0","v7.0.1","v7.0.2","v7.0.3","v7.0.4","v7.0.5","v7.0.6","v7.0.7"]}],"products":[{"vendor":"yoast","product":"yoast_seo"}],"references":[{"url":"https://typo3.org/help/security-advisories/security","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://typo3.org/security/advisory/typo3-ext-sa-2021-013","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36788","tags":["advisory"]},{"url":"https://github.com/Yoast/Yoast-SEO-for-TYPO3/commit/a8278dae97dce8cd0722d38f7f5a30b563668590","tags":["web"]},{"url":"https://typo3.org/security/advisory/typo3-ext-sa-2021-012","tags":["web"]},{"url":"https://github.com/advisories/GHSA-28w5-j8xj-2xwc"},{"url":"https://github.com/Yoast/Yoast-SEO-for-TYPO3","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-36788","description":"The yoast_seo (aka Yoast SEO) extension before 7.2.3 for TYPO3 allows XSS.","status":"published","published":"2021-08-13T16:09:42Z","modified":"2024-08-04T01:01:59.78Z","updated_at":"2026-11-02T14:33:06.32268Z"}],"euvd":[{"id":"EUVD-2021-1947","description":"The yoast_seo (aka Yoast SEO) extension before 7.2.3 for TYPO3 allows XSS.","status":"published","published":"2021-08-13T16:09:42Z","modified":"2024-08-04T01:01:59Z","updated_at":"2026-11-03T03:24:29.329171Z"}],"ghsa":[{"id":"GHSA-28w5-j8xj-2xwc","title":"Cross-site Scripting in the yoast_seo TYPO3 extension","description":"The extension fails to properly encode user input for output in HTML context. A TYPO3 backend user account is required to exploit the vulnerability.","status":"published","published":"2021-09-01T18:36:44Z","modified":"2023-02-01T05:06:05Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:36:36.66596Z"}],"nvd":[{"id":"CVE-2021-36788","description":"The yoast_seo (aka Yoast SEO) extension before 7.2.3 for TYPO3 allows XSS.","status":"published","published":"2021-08-13T17:15:16.66Z","modified":"2026-06-17T03:59:25.473Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:56.943671Z"}],"osv":[{"id":"GHSA-28w5-j8xj-2xwc","title":"Cross-site Scripting in the yoast_seo TYPO3 extension","description":"The extension fails to properly encode user input for output in HTML context. A TYPO3 backend user account is required to exploit the vulnerability.","status":"published","published":"2021-09-01T18:36:44Z","modified":"2023-11-08T04:06:16.613887Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:33.956911Z"}]}}