#VU53817 Permissions, Privileges, and Access Controls in Nextcloud Mail - CVE-2021-32652

Vulnerability identifier: #VU53817

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-32652

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nextcloud Mail
Web applications / Modules and components for CMS

Vendor: Nextcloud

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to application does not properly impose security restrictions. A remote authenticated attacker can access mail metadata of other users. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Mail: 1.4.0 - 1.8.1

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External links
https://hackerone.com/reports/1094063
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mxx2-6rg9-v2vc

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.