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CVE-2021-39220 Details

Description

Nextcloud is an open-source, self-hosted productivity platform The Nextcloud Mail application prior to versions 1.10.4 and 1.11.0 does by default not render images in emails to not leak the read state or user IP. The privacy filter failed to filter images with a relative protocol. It is recommended that the Nextcloud Mail application is upgraded to 1.10.4 or 1.11.0. There are no known workarounds aside from upgrading.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:3.5 LOWVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://github.com/nextcloud/mail/pull/5470	CVE	PatchThird Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q9v-wm8r-rcv5	CVE	Third Party Advisory
https://hackerone.com/reports/1308147	CVE	Permissions Required
https://github.com/nextcloud/mail/pull/5470	[email protected]	PatchThird Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q9v-wm8r-rcv5	[email protected]	Third Party Advisory
https://hackerone.com/reports/1308147	[email protected]	Permissions Required

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-20	Improper Input Validation	[email protected]
CWE-20	Improper Input Validation	[email protected]
CWE-200	Exposure of Sensitive Information to an Unauthorized Actor	[email protected]

Affected Products

Product	Versions
nextcloud mail	< 1.10.4
CPE cpe:2.3:a:nextcloud:mail:::::::: Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Aug 5, 2022	Reanalysis	[email protected]
Oct 27, 2021	Initial Analysis	[email protected]