CVE-2026-75006

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, 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. This issue exists because of insufficient fixes for CVE-2026-35540, CVE-2026-48843 and CVE-2026-62643.

CVSS v3 5.8 MEDIUM

5.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/roundcube/roundcubemail/commit/7e10ca0110b7c9aa1b7850b843bb6625e47bbe00	Patch
https://github.com/roundcube/roundcubemail/commit/8a92380b06b5df1481e034c4f40d6a6546c21223	Patch
https://github.com/roundcube/roundcubemail/commit/92f85c883594e5be757154f94548a9ba903455c9	Patch
https://github.com/roundcube/roundcubemail/commit/c111b72950cd2bf57d6b86cd129568d90403322d	Patch
https://github.com/roundcube/roundcubemail/releases/tag/1.6.18	Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.7.3	Release Notes
https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:roundcube:webmail::::::::
	cpe:2.3:a:roundcube:webmail::::::::

History

No history.

Information

Published : 2026-08-17 13:16

Updated : 2026-09-08 18:43

NVD link : CVE-2026-75006

Mitre link : CVE-2026-75006

CVE.ORG link : CVE-2026-75006

JSON object : View

Products Affected

roundcube

webmail

CWE

CWE-918

Server-Side Request Forgery (SSRF)

{"id": "CVE-2026-75006", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-75006", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-17T14:06:37.236615Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "cve@mitre.org", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "cve@mitre.org", "affectedData": [{"vendor": "Roundcube", "product": "Webmail", "versions": [{"status": "affected", "version": "1.6.0", "lessThan": "1.6.18", "versionType": "semver"}, {"status": "affected", "version": "1.7.0", "lessThan": "1.7.3", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-08-17T13:16:55.240", "references": [{"url": "https://github.com/roundcube/roundcubemail/commit/7e10ca0110b7c9aa1b7850b843bb6625e47bbe00", "tags": ["Patch"], "source": "cve@mitre.org"}, {"url": "https://github.com/roundcube/roundcubemail/commit/8a92380b06b5df1481e034c4f40d6a6546c21223", "tags": ["Patch"], "source": "cve@mitre.org"}, {"url": "https://github.com/roundcube/roundcubemail/commit/92f85c883594e5be757154f94548a9ba903455c9", "tags": ["Patch"], "source": "cve@mitre.org"}, {"url": "https://github.com/roundcube/roundcubemail/commit/c111b72950cd2bf57d6b86cd129568d90403322d", "tags": ["Patch"], "source": "cve@mitre.org"}, {"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.18", "tags": ["Release Notes"], "source": "cve@mitre.org"}, {"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7.3", "tags": ["Release Notes"], "source": "cve@mitre.org"}, {"url": "https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3", "tags": ["Vendor Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cve@mitre.org", "description": [{"lang": "en", "value": "CWE-918"}]}], "descriptions": [{"lang": "en", "value": "In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, 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. This issue exists because of insufficient fixes for CVE-2026-35540, CVE-2026-48843 and CVE-2026-62643."}], "lastModified": "2026-09-08T18:43:44.230", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D51A5415-8AC6-49A9-AAA8-9ED72D9A551E", "versionEndExcluding": "1.6.18", "versionStartIncluding": "1.6.0"}, {"criteria": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D5C9B7FB-8223-444C-B728-6E724AC2F0C9", "versionEndExcluding": "1.7.3", "versionStartIncluding": "1.7.0"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}