CVE-2026-75003: Roundcube Webmail

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, an unclosed url() in a FuncIRI attribute of an SVG image could evade the remote image blocking, which may lead to information disclosure or privilege escalation.

Affected products

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

Published 2026-08-17. Last modified 2026-09-10.