{"id":"GHSA-xpqh-grpw-4xmg","aliases":["CVE-2026-35544"],"title":"Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"MODERATE","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important.","severity":"medium","score":5.3,"published":"2026-04-03T06:31:32.000Z","modified":"2026-04-04T07:11:22.193Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"roundcube/roundcubemail","sources":[{"name":"OSV · GHSA-xpqh-grpw-4xmg","url":"https://osv.dev/vulnerability/GHSA-xpqh-grpw-4xmg"}],"ranges":[{"events":[{"introduced":"1.7-beta"},{"fixed":"1.7-rc5"}],"type":"ECOSYSTEM"}],"versions":["1.7-beta","1.7-beta2","1.7-rc","1.7-rc2","1.7-rc3","1.7-rc4"],"fixed":["1.7-rc5"]}],"sourceAffected":[],"references":["https://nvd.nist.gov/vuln/detail/CVE-2026-35544","https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662","https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0","https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7","https://github.com/roundcube/roundcubemail","https://github.com/roundcube/roundcubemail/releases/tag/1.5.14","https://github.com/roundcube/roundcubemail/releases/tag/1.6.14","https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5","https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14"],"sources":[{"name":"OSV","id":"GHSA-xpqh-grpw-4xmg","modified":"2026-04-04T07:11:22.193001Z","url":"https://osv.dev/vulnerability/GHSA-xpqh-grpw-4xmg"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3}],"products":[],"remediation":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T22:35:31.831Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}