CVE-2026-74998

—

CVSS 3.1

7.2 high

EPSS

<1%p19

Published

Aug 17, 2026 (29d ago)

Modified

Sep 8, 2026

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.

Vendors: roundcube
Products: webmail
Weakness: CWE-79
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.3%)

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