{"id":"CVE-2026-104083","revision":"416bdddb4a76400194047cf9fd747ab1","records":[{"revision":"416bdddb4a76400194047cf9fd747ab1","observedAt":"2026-10-27T03:22:55.977+00:00","statement":{"source":"cve-program","id":"CVE-2026-104083","aliases":[],"title":"SmarterMail < Build 9777 Stored Mutation XSS via MathML Foreign Content","description":"SmarterMail before build 9777 contains a stored mutation cross-site scripting vulnerability that allows remote attackers to inject executable script by placing payloads inside a <style> element nested within MathML foreign content (<math><mtext><mglyph>), which the custom HTML sanitizer treats as inert CDATA text but browsers reparse as live markup. Attackers can deliver a crafted calendar (iCal) message containing an <img src=x onerror=...> payload that executes automatically in the recipient's webmail session at /interface/message-iframe when the message is opened, enabling script execution and data exfiltration unconstrained by the interface's permissive Content-Security-Policy.","state":0,"publishedAt":"2026-10-09T15:06:57.154+00:00","modifiedAt":"2026-10-27T01:30:36.776+00:00","affected":[{"ecosystem":"Vendor product","name":"Smartermail","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"vendor\": \"Smartertools\",\n                    \"product\": \"Smartermail\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"custom\",\n                            \"lessThan\": \"Build 9777\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":5.3,"severity":"MEDIUM"},{"system":"CVSS 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,"severity":"MEDIUM"}],"references":["https://www.smartertools.com/smartermail/release-notes/current#/9526:~:text=Build%209777%20(Oct%208%2C%202026)","https://blog.evan.lat/posts/sm/","https://www.vulncheck.com/advisories/smartermail-build-9777-stored-mutation-xss-via-mathml-foreign-content"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-104083","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-104083","identifiers":["CVE-2026-104083"]},"retained":false,"historicalAffected":[]}],"coverage":[]}