Roundcube Webmail up to 1.5.14/1.6.14 SVG Content resource transfer

Summaryinfo

A vulnerability was found in Roundcube Webmail up to 1.5.14/1.6.14. It has been classified as problematic. Affected by this issue is some unknown functionality of the component SVG Content Handler. Performing a manipulation results in resource transfer. This vulnerability is cataloged as CVE-2026-35545. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in Roundcube Webmail up to 1.5.14/1.6.14. This affects an unknown code block of the component SVG Content Handler. The manipulation with an unknown input leads to a resource transfer vulnerability. CWE is classifying the issue as CWE-669. The product does not properly transfer a resource/behavior to another sphere, or improperly imports a resource/behavior from another sphere, in a manner that provides unintended control over that resource. This is going to have an impact on integrity. The summary by CVE is:

An issue was discovered in Roundcube Webmail before 1.5.15 and 1.6.15. The remote image blocking feature can be bypassed via SVG content in an e-mail message. This may lead to information disclosure or access-control bypass. This involves the animate element with attributeName=fill/filter/stroke.

It is possible to read the advisory at roundcube.net. This vulnerability is uniquely identified as CVE-2026-35545 since 04/03/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 304900 (Linux Distros Unpatched Vulnerability : CVE-2026-35545), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.5.15 or 1.6.15 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 7ad62de184368bf42c0f522d1aacc030f5ddcc46 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (304900) and CERT Bund (WID-SEC-2026-0789). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Open Source Roundcube

Productinfo

Type

• Mail Client Software

Vendor

• Roundcube

Name

• Webmail

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6
• 1.5.7
• 1.5.8
• 1.5.9
• 1.5.10
• 1.5.11
• 1.5.12
• 1.5.13
• 1.5.14
• 1.6.0
• 1.6.1
• 1.6.2
• 1.6.3
• 1.6.4
• 1.6.5
• 1.6.6
• 1.6.7
• 1.6.8
• 1.6.9
• 1.6.10
• 1.6.11
• 1.6.12
• 1.6.13
• 1.6.14

License

• free

CPE 2.3info

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CPE 2.2info

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Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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