{"apiVersion":"1.0","identifier":"CVE-2026-55850","description":"Element Web is a Matrix web client built using the Matrix React SDK. Prior to 1.12.22, EmbeddedPage in apps/web/src/components/structures/EmbeddedPage.tsx renders homeserver-supplied homepage content through dangerouslySetInnerHTML without passing it through sanitizedHtmlNode. A malicious homeserver can provide crafted HTML that Element Web renders on the homepage; the content security policy prevents JavaScript but not phishing HTML. This issue is fixed in version 1.12.22.","publishedAt":"2026-08-21T19:17:04","lastModifiedAt":"2026-08-21T20:16:37","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55850","cvssScore":5.3,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/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","epssProbability":0.00315,"riskScore":0.55,"affectedProduct":"Element Web","affectedVersions":"<1.12.22","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-55850","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-55850","en":"https://www.redsauce.net/en/cves/CVE-2026-55850","fr":"https://www.redsauce.net/fr/cves/CVE-2026-55850","pt":"https://www.redsauce.net/pt/cves/CVE-2026-55850","de":"https://www.redsauce.net/de/cves/CVE-2026-55850","sk":"https://www.redsauce.net/sk/cves/CVE-2026-55850","el":"https://www.redsauce.net/el/cves/CVE-2026-55850"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-55850"}}