CVE-2021-32656

Summary

Nextcloud Server is a Nextcloud package that handles data storage. A vulnerability in federated share exists in versions prior to 19.0.11, 20.0.10, and 21.0.2. An attacker can gain access to basic information about users of a server by accessing a public link that a legitimate server user added as a federated share. This happens because Nextcloud supports sharing registered users with other Nextcloud servers, which can be done automatically when selecting the "Add server automatically once a federated share was created successfully" setting. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2 As a workaround, disable "Add server automatically once a federated share was created successfully" in the Nextcloud settings.

Affected Software

VendorProductVersion RangeStatus
nextcloudsecurity-advisories< 19.0.11affected
nextcloudsecurity-advisories>= 20.0.0, < 20.0.10affected
nextcloudsecurity-advisories>= 21.0.0, < 21.0.2affected

Weaknesses

  • CWE-284: CWE-284: Improper Access Control

ADP Enrichment

CVE Program Container

Additional References

References