CVE-2021-32707 Information

Description

Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6 the Nextcloud Mail application does not by default render images in emails to not leak the read state. The privacy filter failed to filter images with a background-image CSS attribute. Note that the images were still passed through the Nextcloud image proxy and thus there was no IP leakage. The issue was patched in version 1.9.6 and 1.10.0. No workarounds are known to exist.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Reference

https://hackerone.com/reports/1215251 https://github.com/nextcloud/mail/pull/5189 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crh

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

4.3