{"id":"GHSA-x4q5-8j5g-hpjc","aliases":["CVE-2026-35539"],"title":"Roundcube Webmail: Insufficient HTML attachment sanitization in preview mode","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment.","severity":"medium","score":6.1,"published":"2026-04-03T06:31:32.000Z","modified":"2026-04-04T07:11:22.048Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"roundcube/roundcubemail","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"]}],"references":["https://nvd.nist.gov/vuln/detail/CVE-2026-35539","https://github.com/roundcube/roundcubemail/commit/10a6d1fa8acac85c727b0a6ae4a6642bfa27bea1","https://github.com/roundcube/roundcubemail/commit/1b30edf5369668c92fe91dae3d52e477c808aa4f","https://github.com/roundcube/roundcubemail/commit/d742954ccbcdee7020f8f2e7c49ce0fca5a0efab","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-x4q5-8j5g-hpjc","modified":"2026-04-04T07:11:22.048322Z","url":"https://osv.dev/vulnerability/GHSA-x4q5-8j5g-hpjc"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1}]}