CVE-2021-37630

MEDIUM

Nextcloud Circles < 0.19.5 - Unauthenticated Authorization Bypass via Secret Circle Join

Title source: llm
STIX 2.1

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.

References (3)

Core 3
Core References
Patch, Third Party Advisory x_refsource_misc
https://github.com/nextcloud/circles/pull/768
Permissions Required, Third Party Advisory x_refsource_misc
https://hackerone.com/reports/1257624

Scores

CVSS v3 6.5
EPSS 0.0116
EPSS Percentile 63.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-639
Status published
Products (1)
nextcloud/circles < 0.19.5
Published Sep 07, 2021
Tracked Since Feb 18, 2026