Medium severity · published Jul 12, 2021
CVE-2021-32707
Nextcloud Mail is a mail app for Nextcloud
4.3
CVSS
1.1%
EPSS
No
On KEV
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
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 67% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mail · Nextcloud
before 1.9.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32707
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-32707
Patch
https://github.com/nextcloud/mail/pull/5189
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crh
Exploit
https://hackerone.com/reports/1215251
More from Mail
9.8
CVE-2023-48307
Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform
9.8
CVE-2022-31132
Unauthenticated SSRF in 3rd party module "cerdic/csstidy"
8.1
CVE-2024-52508
Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform
7.0
CVE-2020-8156
A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack
6.5
CVE-2023-23944
Nextcloud mail is an email app for the nextcloud home server platform