{"id":"CVE-2026-35540","published":"2026-04-03T03:47:51Z","modified":"2026-04-03T12:52:38Z","title":"An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14","vendor":"Roundcube","product":"Webmail","tier":"tail","description":{"text":"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.","provenance":"source","from":"CVE.org"},"cvss":{"score":5.4,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00401,"percentile":0.34377,"provenance":"source"},"cwes":[{"id":"CWE-669","name":"Incorrect Resource Transfer Between Spheres"}],"references":[{"url":"https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14","tags":[]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5","tags":[]},{"url":"https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942","tags":[]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.6.14","tags":[]},{"url":"https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870","tags":[]}],"priority":{"score":10.7,"factors":[{"name":"EPSS percentile","points":6.88},{"name":"CVSS severity","points":3.78}]},"vendorSlug":"roundcube","affectedVersions":[{"vendor":"Roundcube","product":"Webmail","versions":[">= 1.6.0, < 1.6.14"]}],"affected":[{"ecosystem":"Packagist","package":"roundcube/roundcubemail","vulnerableRanges":[">=1.7-beta, <1.7-rc5"],"patched":["1.7-rc5"],"from":["GHSA-vxg2-hhgr-37fx"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-18583","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-roundcube-webmail-cve-2026-35540","children":[{"from":"CVE-2026-35540","to":"CVE-2026-48843","relation":"incomplete-fix","confidence":"high","kind":"lineage","evidence":[{"kind":"text","provenance":"source","relation":"incomplete-fix","quote":"The issue stems from an insufficient fix for CVE-2026-35540.","from":"CVE.org","in":"CVE-2026-48843"}]},{"from":"CVE-2026-35540","to":"CVE-2026-62643","relation":"incomplete-fix","confidence":"high","kind":"lineage","evidence":[{"kind":"text","provenance":"source","relation":"incomplete-fix","quote":"NOTE: this issue exists because of insufficient fixes for CVE-2026-35540 and CVE-2026-48843.","from":"CVE.org","in":"CVE-2026-62643"}]},{"from":"CVE-2026-35540","to":"CVE-2026-75006","relation":"incomplete-fix","confidence":"high","kind":"lineage","evidence":[{"kind":"text","provenance":"source","relation":"incomplete-fix","quote":"This issue exists because of insufficient fixes for CVE-2026-35540, CVE-2026-48843 and CVE-2026-62643.","from":"CVE.org","in":"CVE-2026-75006"}]}]}}