Is CVE-2026-74998 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-74998?

CVE-2026-74998 has a CVSS v3 severity of HIGH (7.2).

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CVE-2026-74998

Description

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.