Vulnerability identifier: #VU65374

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-31131

CWE-ID: CWE-639

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 bypass authentication process.

The vulnerability exists due to missing ownership check when updating or deleting mail attachments. A remote user can cause the attachment is unavailable for the given message in the outbox.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Mail: 1.0.0 - 1.12.1

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External links
http://github.com/nextcloud/mail/pull/6600/commits/6dd2527be8d4f6788b449c8a8f5577628b990605
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-xhv7-5mhv-299j
http://github.com/nextcloud/mail/pull/6600

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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.