CVE-2025-66553: Nextcloud Tables app allowed users to view columns metadata information of any table

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-05 · updated 2026-10-15
Weakness: CWE-639

Description

Nextcloud Tables allows you to create your own tables with individual columns. Prior to 0.8.7 and 0.9.4, authenticated users were able to view meta data of columns in other tables of the Tables app by modifying the numeric ID in a request. This vulnerability is fixed in 0.8.7 and 0.9.4.

Affected products

nextcloud Tables: from 0.8.0 before 0.8.7; from 0.9.0 before 0.9.4 — fixed in 0.8.7, 0.9.4

How to fix

Upgrade to a fixed version: nextcloud Tables 0.8.7, 0.9.4. Check the vendor advisory for mitigations.

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-p53h-6294-crjw
https://github.com/nextcloud/tables/commit/e975f5bfedb6922f04cdd236cde4e26067fe064e
https://github.com/nextcloud/tables/pull/1891
https://hackerone.com/reports/3138721

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