{"affected":[{"defaultStatus":"unaffected","product":"suneditor","source":"CNA: VulnCheck","vendor":"JiHong88","versions":[{"lessThan":"3.4.0","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"3.4.0","versionType":"semver"}]}],"cveId":"CVE-2026-124493","cwes":["CWE-79"],"description":"SunEditor before 3.4.0 contains a stored cross-site scripting vulnerability in the DocumentType constructor that injects header textContent into innerHTML without HTML escaping. Attackers can store entity-encoded HTML in h1-h6 headers that executes JavaScript when editors using document:header mode initialize, enabling session cookie theft.","epss":{"date":"2026-11-12","percentile":0.28348,"score":0.00344},"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://github.com/JiHong88/suneditor/security/advisories/GHSA-h9pq-57qf-vvfh"}],"kev":null,"metrics":[{"score":9.3,"severity":"critical","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N","version":"4.0"},{"score":9.3,"severity":"critical","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"}],"modifiedAt":1794515311817,"publishedAt":1794143769204,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/JiHong88/suneditor/security/advisories/GHSA-h9pq-57qf-vvfh"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/suneditor-before-3.4.0-stored-xss-via-documenttype-header-textcontent"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://github.com/JiHong88/suneditor/security/advisories/GHSA-h9pq-57qf-vvfh"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/JiHong88/suneditor/security/advisories/GHSA-h9pq-57qf-vvfh"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/suneditor-before-3.4.0-stored-xss-via-documenttype-header-textcontent"},{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":[],"url":"https://github.com/JiHong88/suneditor/security/advisories/GHSA-h9pq-57qf-vvfh"}],"remediation":[],"revision":"cda8056675fc22bbf652f97b2194836cab6f0b6fda98b3da6d3c9fb3372b0c99","sources":[{"modifiedAt":1794492762900,"name":"CNA: VulnCheck","retrievedAt":1794496282899,"url":"https://www.cve.org/CVERecord?id=CVE-2026-124493"},{"modifiedAt":1794515311817,"name":"NVD","retrievedAt":1794529136758,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124493"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794496288459,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-124493"}],"ssvc":{"assessedAt":1794492691348,"automatable":"yes","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"SunEditor before 3.4.0 Stored XSS via DocumentType Header textContent","updatedAt":1794529136758}