Roundcube Webmail up to 1.5.13/1.6.13 Password Plugin type confusion

Summaryinfo

A vulnerability labeled as problematic has been found in Roundcube Webmail up to 1.5.13/1.6.13. The affected element is an unknown function of the component Password Plugin. Such manipulation leads to type confusion. This vulnerability is traded as CVE-2026-35541. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Roundcube Webmail up to 1.5.13/1.6.13 and classified as problematic. Affected by this issue is an unknown part of the component Password Plugin. The manipulation with an unknown input leads to a type confusion vulnerability. Using CWE to declare the problem leads to CWE-843. The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Incorrect password comparison in the password plugin could lead to type confusion that allows a password change without knowing the old password.

The advisory is shared for download at roundcube.net. This vulnerability is handled as CVE-2026-35541 since 04/03/2026. The exploitation is known to be difficult. The attack may be launched remotely. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 304902 (Linux Distros Unpatched Vulnerability : CVE-2026-35541), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.5.14 or 1.6.14 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 2e6a99b2a38110907ea8d3be8e59ec3d5802c394 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 vulnerability database at Tenable (304902). VulDB is the best source for vulnerability data and more expert information about this specific topic.

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
• 1.6.0
• 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

License

• free

CPE 2.3info

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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