CVE-2021-32707CWE-20CWE-200

Bypass of image blocking in Nextcloud Mail

Medium · published July 12, 2021

CVSS v3.1
4.3
EPSS
1%
Percentile
66.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.01146 · 66.5th percentile
Weaknesses
CWE-20 · Improper Input Validation; CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2021-07-12T19:05Z
EPSS history
Timeline
  • 12 JUL 19:05Z
    Bypass of image blocking in Nextcloud Mail
    cvelistv5