Bug 2517409 (CVE-2026-74998) - CVE-2026-74998 roundcubemail: information disclosure or XSS via MIME sniffing
Summary: CVE-2026-74998 roundcubemail: information disclosure or XSS via MIME sniffing
Keywords:
Status: NEW
Alias: CVE-2026-74998
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2522977 2522981
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-17 13:01 UTC by OSIDB Bzimport
Modified: 2026-08-24 19:22 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-08-17 13:01:22 UTC 
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.
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