A vulnerability classified as problematic has been found in Nextcloud Calendar App up to 3.5.4/4.2.2 (Calendar Software). Affected is an unknown part of the component SMTP Server Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:

Calendar app for Nextcloud easily sync events from various devices with your Nextcloud. Some internal paths of the website are disclosed when the SMTP server is unavailable. It is recommended that the Calendar app is updated to 3.5.5 or 4.2.3

The weakness was shared 05/30/2023 as GHSA-2792-2734-hr7j. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2023-33183 since 05/17/2023. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 3.5.5 or 4.2.3 eliminates this vulnerability. Applying a patch 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.

Productinfo

Type

• Calendar Software

Vendor

• Nextcloud

Name

• Calendar App

Version

• 3.5.0
• 3.5.1
• 3.5.2
• 3.5.3
• 3.5.4
• 4.2.0
• 4.2.1
• 4.2.2

License

• open-source

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CPE 2.2info

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