{"cve":"CVE-2023-45818","nvd":{"published":"2023-10-19T22:15:10.817","modified":"2026-06-17T06:29:35.170","status":"Modified","description":"TinyMCE is an open source rich text editor. A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo and redo functionality. When a carefully-crafted HTML snippet passes the XSS sanitisation layer, it is manipulated as a string by internal trimming functions before being stored in the undo stack. If the HTML snippet is restored from the undo stack, the combination of the string manipulation and reparative parsing by either the browser's native [DOMParser API](https://developer.mozilla.org/en-US/docs/Web/API/DOMParser) (TinyMCE 6) or the SaxParser API (TinyMCE 5) mutates the HTML maliciously, allowing an XSS payload to be executed. This vulnerability has been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by ensuring HTML is trimmed using node-level manipulation instead of string manipulation. Users are advised to upgrade. There are no known workarounds for this vulnerability.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://github.com/tinymce/tinymce/security/advisories/GHSA-v65r-p3vv-jjfv","https://researchgate.net/publication/266654651_mXSS_attacks_Attacking_well-secured_web-applications_by_using_innerHTML_mutations","https://tiny.cloud/docs/release-notes/release-notes5108/#securityfixes","https://tiny.cloud/docs/tinymce/6/6.7.1-release-notes/#security-fixes","https://www.tiny.cloud/docs/api/tinymce.html/tinymce.html.saxparser/"],"products":["tiny:tinymce"],"source":"nvd","synced_at":"2026-10-19T21:40:11.519948003+00:00"},"epss":{"cve":"CVE-2023-45818","score":0.00759,"percentile":0.55289,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-v65r-p3vv-jjfv","url":"https://osv.dev/vulnerability/GHSA-v65r-p3vv-jjfv","summary":"TinyMCE mXSS vulnerability in undo/redo, getContent API, resetContent API, and Autosave plugin","modified":"2026-09-10T03:49:25.360614574Z","packages":[{"ecosystem":"npm","name":"tinymce","purl":"pkg:npm/tinymce","ranges":[">=6.0.0 <6.7.1"],"fixed":["6.7.1"]},{"ecosystem":"NuGet","name":"TinyMCE","purl":"pkg:nuget/TinyMCE","ranges":[">=6.0.0 <6.7.1"],"fixed":["6.7.1"]},{"ecosystem":"Packagist","name":"tinymce/tinymce","purl":"pkg:composer/tinymce/tinymce","ranges":[">=6.0.0 <6.7.1"],"fixed":["6.7.1"]},{"ecosystem":"npm","name":"tinymce","purl":"pkg:npm/tinymce","ranges":["<5.10.8"],"fixed":["5.10.8"]},{"ecosystem":"NuGet","name":"TinyMCE","purl":"pkg:nuget/TinyMCE","ranges":["<5.10.8"],"fixed":["5.10.8"]},{"ecosystem":"Packagist","name":"tinymce/tinymce","purl":"pkg:composer/tinymce/tinymce","ranges":["<5.10.8"],"fixed":["5.10.8"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}