CVE-2026-74998

HighCVSS 7.2/10Last 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.

Metrics

CVSS 3.1 7.2/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

VendorProductVersions
RoundcubeWebmail>= 1.6.0, < 1.6.18; >= 1.7.0, < 1.7.3

References

Timeline

Published
Aug 17, 2026
Last modified
Sep 8, 2026
NVD status
Analyzed

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CVE-2026-74998: High severity, CVSS 7.2 | Vulnix