CVE-2025-66551 Nextcloud Tables is missing an ownership check which allows moving columns into tables of other users
A malicious user can move columns into other users' tables due to missing ownership checks, allowing unauthorized data modification.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-66551?
CVE-2025-66551 is a medium-severity missing authorization vulnerability in nextcloud security-advisories, published on 5 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Nextcloud Tables allows you to create your own tables with individual columns. Prior to 0.8.6 and 0.9.3, a malicious user was able to create their own table and then move a column to a victims table. This vulnerability is fixed in 0.8.6 and 0.9.3.
Weakness: CWE-639
Which versions are affected by CVE-2025-66551?
It affects 1 product.
Products include Nextcloud Tables.
How do I fix CVE-2025-66551?
No fix has been published for CVE-2025-66551 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-66551 being exploited?
There is no known exploitation of CVE-2025-66551 in the wild and no public exploit code.
Other vulnerabilities in nextcloud security-advisories
- CVE-2026-45545 Nextcloud: SQL Injection in Column Type Parameter Allows Arbitrary SQL Execution
- CVE-2026-45722 Nextcloud: Tables app allows limited SQLi in ORDER BY with malicious sort order argument for Table Views
- CVE-2024-52511 Nextcloud Tables has an Authorization Bypass Through User-Controlled Key in Tables
- CVE-2026-45544 Nextcloud: Information Disclosure of view filter metdata via Broken Sensitive Data Masking in ViewService
- CVE-2025-66513 Nextcloud Tables app share information not limited to relevant users
Sources
Also known as GHSA-w787-vwqp-8wr7.