{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-9818", "assignerOrgId": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd", "state": "PUBLISHED", "assignerShortName": "OCD", "dateReserved": "2026-05-28T10:37:45.625Z", "datePublished": "2026-05-28T12:16:05.464Z", "dateUpdated": "2026-05-28T12:16:05.464Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd", "shortName": "OCD", "dateUpdated": "2026-05-28T12:16:05.464Z"}, "title": "Roundcube Local/Private URL Fetch Bypass", "datePublic": "2026-05-28T10:58:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-184", "description": "CWE-184 Incomplete list of disallowed inputs", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-554", "descriptions": [{"lang": "en", "value": "CAPEC-554 Functionality Bypass"}]}, {"capecId": "CAPEC-664", "descriptions": [{"lang": "en", "value": "CAPEC-664 Server Side Request Forgery"}]}], "affected": [{"vendor": "Roundcube", "product": "Webmail", "repo": "https://github.com/roundcube/roundcubemail/", "versions": [{"status": "affected", "version": "0", "lessThan": "1.6.16", "changes": [{"at": "1.6.16", "status": "unaffected"}], "versionType": "git"}, {"status": "affected", "version": "1.7.0", "lessThan": "1.7.1", "changes": [{"at": "1.7.1", "status": "unaffected"}], "versionType": "git"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*", "versionStartIncluding": "0", "versionEndExcluding": "1.6.16"}, {"vulnerable": true, "criteria": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.7.0", "versionEndExcluding": "1.7.1"}]}]}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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."}]}], "references": [{"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7.1", "tags": ["patch"]}, {"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.16", "tags": ["patch"]}, {"url": "https://github.com/roundcube/roundcubemail/commit/faf867432f51ebbe100382a70a9e3c042415ee1b", "tags": ["patch"]}, {"url": "https://github.com/roundcube/roundcubemail/commit/7b52353653a67e6073b97d70eb94047132b78556", "tags": ["patch"]}, {"url": "https://advisories.orangecyberdefense.com/advisories/163", "tags": ["third-party-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 4.7, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N"}}], "solutions": [{"lang": "en", "value": "Upgrade to Roundcube Webmail 1.6.16 or 1.7.1", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Upgrade to Roundcube Webmail 1.6.16 or 1.7.1"}]}], "credits": [{"lang": "en", "value": "Guillaume Meunier from Orange Cyberdefense CERT VOC Team", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-9818", "lastModified": "2026-05-28T13:16:25.440", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd", "type": "Secondary"}]}, "published": "2026-05-28T13:16:25.440", "references": [{"source": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd", "url": "https://advisories.orangecyberdefense.com/advisories/163"}, {"source": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd", "url": "https://github.com/roundcube/roundcubemail/commit/7b52353653a67e6073b97d70eb94047132b78556"}, {"source": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd", "url": "https://github.com/roundcube/roundcubemail/commit/faf867432f51ebbe100382a70a9e3c042415ee1b"}, {"source": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd", "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.16"}, {"source": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd", "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7.1"}], "sourceIdentifier": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-184"}], "source": "6064c9f1-42e5-4cc5-a67a-1636d7a9d3fd", "type": "Secondary"}]}

{}

{"created": "2026-05-28T13:15:22.413404+00:00", "updated": "2026-05-28T13:15:22.413417+00:00", "vendors": []}