Auth bypass in Nextcloud Circles
CVE-2021-37630
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.012 (67.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Nextcloud Circles
- Nextcloud Security-Advisories — versions < 0.19.15, >= 0.20.0, < 0.20.11, >= 0.21.0, < 0.21.4
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-56j9-3rj4-wvgm (Third Party Advisory)
- github.com/nextcloud/circles/pull/768 (Patch, Third Party Advisory)
- hackerone.com/reports/1257624 (Permissions Required, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-37630?
- CVE-2021-37630 is a medium-severity vulnerability in Nextcloud Circles, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2021-09-07.
- How severe is CVE-2021-37630?
- Medium severity. CVSS v3 base score is 6.5 out of 10.