Information disclosure in Nextcloud Mail



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-39220
CWE-ID CWE-200
Exploitation vector Network
Public exploit N/A
Vulnerable software
Nextcloud Mail
Web applications / Modules and components for CMS

Vendor Nextcloud

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Information disclosure

EUVDB-ID: #VU57650

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-39220

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

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

The vulnerability exists due to the affected application does by default not render images in emails to not leak the read state or user IP. A remote authenticated attacker can gain unauthorized access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Mail: 1.10.0 - 1.10.3

CPE2.3 External links

https://github.com/nextcloud/mail/pull/5470
https://hackerone.com/reports/1308147
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q9v-wm8r-rcv5


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.



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