What is the CVSS score of CVE-2026-35543?

CVE-2026-35543 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.0%.

Is there a patch available for CVE-2026-35543?

Yes, a patch is available for CVE-2026-35543. Update the affected software to the latest version immediately.

Webmail CVE-2026-35543

EUVD-2026-18589 MEDIUM

Incorrect Resource Transfer Between Spheres (CWE-669)

2026-04-03 mitre

GHSA-j2g6-8rvg-7mf6

Information Disclosure Webmail

5.3

CVSS 3.1 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

5.3 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Primary rating from Vendor (mitre) · only source for this CVE.

CVSS VectorVendor: mitre

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

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.

Technical ContextAI

Roundcube Webmail implements a remote image blocking feature to prevent tracking and protect user privacy when displaying HTML emails. The vulnerability exists in the image filtering mechanism, which fails to properly sanitize SVG (Scalable Vector Graphics) elements that contain animate attributes. SVG is an XML-based vector image format that can embed JavaScript-like behavior through animation directives, allowing attackers to circumvent content security controls. The root cause is classified under CWE-669 (Improper Access Control), indicating the filtering logic does not adequately enforce its intended security policy for all vector graphic formats. The vulnerability affects Roundcube Webmail versions before 1.5.14 (all 1.5.x versions) and before 1.6.14 (all 1.6.x versions up to 1.6.13), as identified via CPE cpe:2.3:a:roundcube:webmail.

RemediationAI

Organizations must upgrade Roundcube Webmail to version 1.5.14, 1.6.14, or later to remediate the vulnerability. Vendor-released patches are available as follows: version 1.5.14 (commit 1a63e01542bff42aaa71c00c4c279a09ef31f20c), version 1.6.14 (commit 39471343ee081ce1d31696c456a2c163462daae3), and version 1.7-rc5 (commit 82ab5eca7b332fce7a174b2b987f0957a66377cd). Administrators should apply the patch corresponding to their current version branch to restore proper SVG content filtering in the email display pipeline. See the official Roundcube security advisory at https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14 for detailed upgrade instructions and release notes.