What’s Vulnerable › Vulnerabilities

CVE-2026-75006

• Severity: medium (CVSS 5.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-17 · updated 2026-09-08
• Weakness: CWE-918

Description

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.

Affected products

• Roundcube Webmail: from 1.6.0 before 1.6.18; from 1.7.0 before 1.7.3 — fixed in 1.6.18, 1.7.3

How to fix

Upgrade to a fixed version: Roundcube Webmail 1.6.18, 1.7.3. Check the vendor advisory for mitigations.

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

Get alerted when CVE-2026-75006 or the next vulnerability affects your stack