{"id":"CVE-2026-74998","published":"2026-08-17T12:40:29Z","modified":"2026-08-17T16:01:16Z","title":"In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were…","vendor":"Roundcube","product":"Webmail","tier":"tail","description":{"text":"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.","provenance":"source","from":"CVE.org"},"cvss":{"score":7.2,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00438,"percentile":0.37986,"provenance":"source"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"references":[{"url":"https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3","tags":[]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.6.18","tags":[]},{"url":"https://github.com/roundcube/roundcubemail/commit/62d33c8a0dc3fd0dd03984220dc9709e8e0de43b","tags":[]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.7.3","tags":[]},{"url":"https://github.com/roundcube/roundcubemail/commit/a2334990c02f7cb77b1a8d6fa97fcd9e1b5cd1fb","tags":[]}],"priority":{"score":12.6,"factors":[{"name":"EPSS percentile","points":7.6},{"name":"CVSS severity","points":5.04}]},"vendorSlug":"roundcube","affectedVersions":[{"vendor":"Roundcube","product":"Webmail","versions":[">= 1.6.0, < 1.6.18",">= 1.7.0, < 1.7.3"]}],"euvd":{"id":"EUVD-2026-60165","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-roundcube-webmail-cwe-79"}}