{"id":"CVE-2026-9818","summary":"Roundcube Local/Private URL Fetch Bypass","details":"Roundcube's HTML sanitization path for message rendering allows loopback, localhost, RFC1918, link-local, and ULA URLs even when remote content loading is disabled. A remote attacker can send an HTML email that causes the victim's browser to issue requests to local or private-network services simply by opening the message preview.","modified":"2026-07-08T08:13:53.706058674Z","published":"2026-05-28T12:16:05.464Z","database_specific":{"cwe_ids":["CWE-184"],"cna_assigner":"OCD","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9818.json"},"references":[{"type":"WEB","url":"https://github.com/roundcube/roundcubemail/"},{"type":"ADVISORY","url":"https://advisories.orangecyberdefense.com/advisories/163"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9818.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9818"},{"type":"FIX","url":"https://github.com/roundcube/roundcubemail/commit/7b52353653a67e6073b97d70eb94047132b78556"},{"type":"FIX","url":"https://github.com/roundcube/roundcubemail/commit/faf867432f51ebbe100382a70a9e3c042415ee1b"},{"type":"FIX","url":"https://github.com/roundcube/roundcubemail/releases/tag/1.6.16"},{"type":"FIX","url":"https://github.com/roundcube/roundcubemail/releases/tag/1.7.1"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/roundcube/roundcubemail","events":[{"introduced":"0"},{"fixed":"ea1798a6fbf060abcc0ba73b2435036bf8016a5a"},{"introduced":"df9effa186f81d676962b941da4ebab5e05c3088"},{"fixed":"d40ec266240f2456a52c24ef2848e18bbfb5c300"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.6.16"},{"introduced":"1.7.0"},{"fixed":"1.7.1"}],"source":"AFFECTED_FIELD"}}],"versions":["1.7.0","1.6.15","1.6.14","1.6.13","1.6.12","1.6.11","1.6.10","1.6.9","1.6.8","1.6.7","1.6.6","1.6.5","1.6.4","1.6.3","1.6.2","1.6.1","1.6.0","1.6-rc","1.6-beta","1.5-rc","1.5-beta","1.4-rc2","1.4-rc1","1.4-beta","1.3-beta","1.2-rc","1.2-beta","1.1.0","1.1-rc","1.1-beta","v0.1-beta2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9818.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N"}]}