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Webmail EUVD-2026-18589

| CVE-2026-35543 MEDIUM
Incorrect Resource Transfer Between Spheres (CWE-669)
2026-04-03 mitre GHSA-j2g6-8rvg-7mf6
Information Disclosure Webmail
5.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
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-2026-18589
Analysis Generated
Apr 03, 2026 - 04:30 vuln.today
CVE Published
Apr 03, 2026 - 03:57 nvd
MEDIUM 5.3

DescriptionCVE.org

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. The remote image blocking feature can be bypassed via SVG content (with animate attributes) in an e-mail message. This may lead to information disclosure or access-control bypass.

AnalysisAI

Roundcube Webmail before versions 1.5.14 and 1.6.14 allows unauthenticated remote attackers to bypass the remote image blocking feature via SVG content containing animate attributes in email messages, leading to information disclosure or access control bypass. The vulnerability has a CVSS score of 5.3 (moderate severity) with low attack complexity and no authentication required, though the confidentiality impact is limited.

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Vulnerability AssessmentAI

Risk Assessment The CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) indicates a network-accessible vulnerability requiring no privileges or user interaction, but with low confidentiality impact and no integrity or availability damage. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a specially crafted HTML email to a Roundcube Webmail user containing an SVG element with animate attributes designed to fetch a remote tracking image or script. When the recipient opens the email, Roundcube's image blocking feature fails to recognize the SVG animate construct as a remote resource request, allowing the embedded SVG animation to execute and contact the attacker's server. …
Remediation Organizations must upgrade Roundcube Webmail to version 1.5.14, 1.6.14, or later to remediate the vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-18589 vulnerability details – vuln.today
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