SSRF in Roundcube Webmail
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.006 (44.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.001
Affected products
- Roundcube Webmail — versions 1.6.0, 1.7.0
Weakness classification (CWE)
References
- github.com/roundcube/roundcubemail/commit/7e10ca0110b7c9aa1b7850b843bb6625e47bb… (Patch)
- github.com/roundcube/roundcubemail/commit/8a92380b06b5df1481e034c4f40d6a6546c21… (Patch)
- github.com/roundcube/roundcubemail/commit/92f85c883594e5be757154f94548a9ba90345… (Patch)
- github.com/roundcube/roundcubemail/commit/c111b72950cd2bf57d6b86cd129568d904033… (Patch)
- github.com/roundcube/roundcubemail/releases/tag/1.6.18 (Release Notes)
- github.com/roundcube/roundcubemail/releases/tag/1.7.3 (Release Notes)
- roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-75006?
- CVE-2026-75006 is a medium-severity vulnerability in Roundcube Webmail, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.8/10. Published 2026-08-17.
- How severe is CVE-2026-75006?
- Medium severity. CVSS v3 base score is 5.8 out of 10.