Medium severity · published Sep 7, 2021
CVE-2021-37630
Nextcloud Circles is an open source social network built for the nextcloud ecosystem
6.5
CVSS
1.2%
EPSS
No
On KEV
Description
Nextcloud Circles is an open source social network built for the nextcloud ecosystem. In affected versions the Nextcloud Circles application allowed any user to join any "Secret Circle" without approval by the Circle owner leaking private information. It is recommended that Nextcloud Circles is upgraded to 0.19.15, 0.20.11 or 0.21.4. There are no workarounds for this issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 68% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CI
Circles · Nextcloud
before 0.19.5; 0.20.0 before 0.20.11; 0.21.0 before 0.21.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-37630
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-37630
Patch
https://github.com/nextcloud/circles/pull/768
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-56j9-3rj4-wvgm
Permissions Required
https://hackerone.com/reports/1257624
More from Circles
5.4
CVE-2021-32782
Nextcloud Circles is an open source social network built for the nextcloud ecosystem
4.3
CVE-2019-15610
Improper authorization in the Circles app 0.17.7 causes retaining access when an email address was removed from a circle