CVE-2026-75006mediumCWE-918

CVE-2026-75006: medium-severity vulnerability in Roundcube Webmail

Published 17 Aug 2026

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.8epss 0.4%

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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Affected products

Roundcube · Webmail

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References

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