{"id":"UBUNTU-CVE-2026-35540","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.","modified":"2026-06-30T14:00:18.751260625Z","published":"2026-04-03T05:16:00Z","upstream":["CVE-2026-35540"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-35540"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-35540"},{"type":"REPORT","url":"https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14"},{"type":"REPORT","url":"https://i0.rs/blog/turning-a-roundcube-link-tag-into-a-zero-day-ssrf-and-data-exfiltration/"},{"type":"REPORT","url":"https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870"},{"type":"REPORT","url":"https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942"},{"type":"REPORT","url":"https://github.com/roundcube/roundcubemail/releases/tag/1.6.14"},{"type":"REPORT","url":"https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5"}],"affected":[{"package":{"name":"roundcube","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.1+dfsg.1-2","1.1.2+dfsg.1-5","1.1.3+dfsg.1-1","1.1.4+dfsg.1-1","1.2~beta+dfsg.1-0ubuntu1","1.2~beta+dfsg.1-0ubuntu1+esm1","1.2~beta+dfsg.1-0ubuntu1+esm2","1.2~beta+dfsg.1-0ubuntu1+esm3","1.2~beta+dfsg.1-0ubuntu1+esm4","1.2~beta+dfsg.1-0ubuntu1+esm5","1.2~beta+dfsg.1-0ubuntu1+esm6","1.2~beta+dfsg.1-0ubuntu1+esm7","1.2~beta+dfsg.1-0ubuntu1+esm8"],"ecosystem_specific":{"binaries":[{"binary_name":"roundcube","binary_version":"1.2~beta+dfsg.1-0ubuntu1+esm8"},{"binary_name":"roundcube-core","binary_version":"1.2~beta+dfsg.1-0ubuntu1+esm8"},{"binary_name":"roundcube-mysql","binary_version":"1.2~beta+dfsg.1-0ubuntu1+esm8"},{"binary_name":"roundcube-pgsql","binary_version":"1.2~beta+dfsg.1-0ubuntu1+esm8"},{"binary_name":"roundcube-plugins","binary_version":"1.2~beta+dfsg.1-0ubuntu1+esm8"},{"binary_name":"roundcube-sqlite3","binary_version":"1.2~beta+dfsg.1-0ubuntu1+esm8"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35540.json"}},{"package":{"name":"roundcube","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0+dfsg.1-1","1.3.1+dfsg.1-1","1.3.3+dfsg.1-1","1.3.3+dfsg.1-2","1.3.6+dfsg.1-1","1.3.6+dfsg.1-1ubuntu0.1~esm1","1.3.6+dfsg.1-1ubuntu0.1~esm2","1.3.6+dfsg.1-1ubuntu0.1~esm3","1.3.6+dfsg.1-1ubuntu0.1~esm4","1.3.6+dfsg.1-1ubuntu0.1~esm5","1.3.6+dfsg.1-1ubuntu0.1~esm6","1.3.6+dfsg.1-1ubuntu0.1~esm7","1.3.6+dfsg.1-1ubuntu0.1~esm8"],"ecosystem_specific":{"binaries":[{"binary_name":"roundcube","binary_version":"1.3.6+dfsg.1-1ubuntu0.1~esm8"},{"binary_version":"1.3.6+dfsg.1-1ubuntu0.1~esm8","binary_name":"roundcube-core"},{"binary_version":"1.3.6+dfsg.1-1ubuntu0.1~esm8","binary_name":"roundcube-mysql"},{"binary_name":"roundcube-pgsql","binary_version":"1.3.6+dfsg.1-1ubuntu0.1~esm8"},{"binary_version":"1.3.6+dfsg.1-1ubuntu0.1~esm8","binary_name":"roundcube-plugins"},{"binary_version":"1.3.6+dfsg.1-1ubuntu0.1~esm8","binary_name":"roundcube-sqlite3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35540.json"}},{"package":{"name":"roundcube","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.8+dfsg.1-2","1.3.10+dfsg.1-1","1.4.1+dfsg.1-2","1.4.2+dfsg.1-1","1.4.2+dfsg.1-2","1.4.3+dfsg.1-1","1.4.3+dfsg.1-1ubuntu0.1~esm1","1.4.3+dfsg.1-1ubuntu0.1~esm2","1.4.3+dfsg.1-1ubuntu0.1~esm3","1.4.3+dfsg.1-1ubuntu0.1~esm4","1.4.3+dfsg.1-1ubuntu0.1~esm5","1.4.3+dfsg.1-1ubuntu0.1~esm6","1.4.3+dfsg.1-1ubuntu0.1~esm7","1.4.3+dfsg.1-1ubuntu0.1~esm8"],"ecosystem_specific":{"binaries":[{"binary_name":"roundcube","binary_version":"1.4.3+dfsg.1-1ubuntu0.1~esm8"},{"binary_name":"roundcube-core","binary_version":"1.4.3+dfsg.1-1ubuntu0.1~esm8"},{"binary_version":"1.4.3+dfsg.1-1ubuntu0.1~esm8","binary_name":"roundcube-mysql"},{"binary_version":"1.4.3+dfsg.1-1ubuntu0.1~esm8","binary_name":"roundcube-pgsql"},{"binary_version":"1.4.3+dfsg.1-1ubuntu0.1~esm8","binary_name":"roundcube-plugins"},{"binary_name":"roundcube-sqlite3","binary_version":"1.4.3+dfsg.1-1ubuntu0.1~esm8"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35540.json"}},{"package":{"name":"roundcube","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11+dfsg.1-4","1.5.0+dfsg.1-2","1.5.0+dfsg.1-2ubuntu0.1~esm1","1.5.0+dfsg.1-2ubuntu0.1~esm2","1.5.0+dfsg.1-2ubuntu0.1~esm3","1.5.0+dfsg.1-2ubuntu0.1~esm4","1.5.0+dfsg.1-2ubuntu0.1~esm5","1.5.0+dfsg.1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