Information disclosure in Nextcloud Mail
CVE-2021-39220
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.008 (51.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N.
Affected products
- Nextcloud Mail
- Nextcloud Security-advisories — versions < 1.10.4, < 1.11.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Permissions Required, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-39220?
- CVE-2021-39220 is a low-severity vulnerability in Nextcloud Mail, classified under Improper Input Validation. CVSS score: 3.5/10. Published 2021-10-25.
- How severe is CVE-2021-39220?
- Low severity. CVSS v3 base score is 3.5 out of 10.