CVE-2026-35540

| EUVD-2026-18583 MEDIUM
2026-04-03 mitre GHSA-vxg2-hhgr-37fx
5.4
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

4
Patch Released
Apr 04, 2026 - 08:30 nvd
Patch available
EUVD ID Assigned
Apr 03, 2026 - 04:30 euvd
EUVD-2026-18583
Analysis Generated
Apr 03, 2026 - 04:30 vuln.today
CVE Published
Apr 03, 2026 - 03:47 nvd
MEDIUM 5.4

Tags

Information Disclosure SSRF

Description

An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.

Analysis

Roundcube Webmail 1.6.0 through 1.6.13 allows Server-Side Request Forgery (SSRF) and Information Disclosure through insufficient CSS sanitization in HTML email messages, enabling attackers to craft malicious stylesheets that reference local network hosts. The vulnerability affects all instances processing HTML emails with external stylesheet links, and does not require authentication due to the unauthenticated attack vector (AV:N, PR:N in CVSS). …

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Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +27
POC: 0

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CVE-2026-35540 vulnerability details – vuln.today
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