Nextcloud Tables up to 2.0.0 Share Listing /apps/tables/share/table tableId privileges management

Summaryinfo

A vulnerability was found in Nextcloud Tables up to 2.0.0. It has been classified as problematic. Affected by this issue is some unknown functionality of the file /apps/tables/share/table of the component Share Listing. The manipulation of the argument tableId leads to privileges management. This vulnerability is traded as CVE-2026-82983. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Nextcloud Tables up to 2.0.0. This issue affects an unknown code block of the file /apps/tables/share/table of the component Share Listing. The manipulation of the argument tableId with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at hackerone.com. The identification of this vulnerability is CVE-2026-82983 since 08/31/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/27/2026). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Cloud Software

Vendor

• Nextcloud

Name

• Tables

Version

• 2.0

License

• open-source

CPE 2.3info

• 🔒

CPE 2.2info

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