MGASA-2026-0507

Fix CSS declaration smuggling via un-encoded ampersand emission, reported by Zach Hanley of Horizon3.ai Fix CSS property injection via body background attribute, reported by zenithhostingevan Fix email header injection via bare CR in the subject field, reported by CVE-Hunter-Leo Fix email header injection via C-escape \r in the recipient display name, reported by dogeshark Fix email header injection via identity’s organization field, reported by dogeshark Fix zero-click stored XSS via TNEF MIME tag injection in the attachment URL, reported by nakko Fix XSS in the HTML editor using text/enriched part content, reported by Joshua Rogers Fix cross-user access in contact group membership (add/remove) in the SQL address book, reported by Joshua Rogers Fix is_local_url() bypass via trailing-dot FQDN in stylesheet URL, reported by nept1337 Fix remote content blocking bypass via CSS escapes in FuncIRI attributes, reported by Wahab KHADIR Fix remote-content blocker bypass via SVG SMIL src animation Fix SSRF bypass in Roundcube CSS proxy via hexadecimal IPv6-mapped IPv4 addresses, reported by faceless0x7 and Harish Annavisamy