{"id":"CVE-2026-74998","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74998","summary":"In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS…","details":"In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.","published":"2026-08-17T13:16:54.270","modified":"2026-08-17T13:16:54.270","cvss":{"score":7.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/roundcube/roundcubemail/commit/62d33c8a0dc3fd0dd03984220dc9709e8e0de43b","label":"roundcube/roundcubemail@62d33c8"},"references":[{"type":"WEB","url":"https://github.com/roundcube/roundcubemail/commit/62d33c8a0dc3fd0dd03984220dc9709e8e0de43b"},{"type":"WEB","url":"https://github.com/roundcube/roundcubemail/commit/a2334990c02f7cb77b1a8d6fa97fcd9e1b5cd1fb"},{"type":"WEB","url":"https://github.com/roundcube/roundcubemail/releases/tag/1.6.18"},{"type":"WEB","url":"https://github.com/roundcube/roundcubemail/releases/tag/1.7.3"},{"type":"WEB","url":"https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-17T13:16:54.270"}}