Vulnerability · Published Sep 7, 2021 · Assigned by GitHub_M

CVE-2021-37630Secret Circle can be joined without approval in Nextcloud Circles

Medium 6.5

In plain English

A medium-severity authorization bypass via user-controlled key in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 68% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)1.2%top 31.6% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
nextcloud	security-advisories	< 0.19.15>= 0.20.0, < 0.20.11>= 0.21.0, < 0.21.4

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-56j9-3rj4-wvgm x_refsource_CONFIRM
https://github.com/nextcloud/circles/pull/768 x_refsource_MISC
https://hackerone.com/reports/1257624 x_refsource_MISC