Vulnerability in Nextcloud Tables

[ Description ]Official description

The Tables app's share-listing endpoint (GET /apps/tables/share/table/{tableId}) did not verify that the requesting user has manage-level permission on the table before returning the full list of share recipients (users, groups, and teams) along with their permission levels. A user who was only granted read-data access to a table, and who is correctly prevented from seeing this information in the web UI, could call the endpoint directly to enumerate everyone the table is shared with and their access levels. This does not expose the table's data itself beyond what the read-data grant already permits, only the list of share recipients and their permission levels.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund26 Oct 2026WID-SEC-2026-4185

  Nextcloud (Server, Tables, Whiteboard, Files Confidential, Collectives, Richdocuments): Multiple vulnerabilities Translated from German

  CVE-2026-77171CVE-2026-82986CVE-2026-77167+7 more CVEs

[ References ]References

• hackerone.com/reports/3524971