{"id":"GHSA-vxg2-hhgr-37fx","summary":"Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages","details":"An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.","aliases":["CVE-2026-35540"],"modified":"2026-04-04T07:11:22.750123Z","published":"2026-04-03T06:31:32Z","database_specific":{"cwe_ids":["CWE-669","CWE-918"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-04-04T06:53:55Z","nvd_published_at":"2026-04-03T05:16:22Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35540"},{"type":"WEB","url":"https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870"},{"type":"WEB","url":"https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942"},{"type":"PACKAGE","url":"https://github.com/roundcube/roundcubemail"},{"type":"WEB","url":"https://github.com/roundcube/roundcubemail/releases/tag/1.6.14"},{"type":"WEB","url":"https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5"},{"type":"WEB","url":"https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14"}],"affected":[{"package":{"name":"roundcube/roundcubemail","ecosystem":"Packagist","purl":"pkg:composer/roundcube/roundcubemail"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.7-beta"},{"fixed":"1.7-rc5"}]}],"versions":["1.7-beta","1.7-beta2","1.7-rc","1.7-rc2","1.7-rc3","1.7-rc4"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-vxg2-hhgr-37fx/GHSA-vxg2-hhgr-37fx.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"}]}