{"id":"CVE-2026-35540","aliases":["GHSA-vxg2-hhgr-37fx"],"url":"https://o3.security/vulnerability/CVE-2026-35540","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.","published":"2026-04-03T03:47:51.456Z","modified":"2026-09-17T11:45:14.252884268Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"roundcube/roundcubemail","fixedVersion":"1.7-rc5"}],"fix":{"url":"https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870","label":"roundcube/roundcubemail@27ec6cc"},"references":[{"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"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35540.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35540"},{"type":"FIX","url":"https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870"},{"type":"FIX","url":"https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-17T11:45:14.252884268Z"}}