# 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.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L`)
- **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 available:** No
- **Published:** 5 Dec 2025
- **Updated:** 9 Dec 2025
- **Also known as:** GHSA-w787-vwqp-8wr7

## 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 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2025-66551?

It affects 1 product.


Products: 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.

## 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](https://insights.sbomify.com/CVE-2026-45545/): Nextcloud: SQL Injection in Column Type Parameter Allows Arbitrary SQL Execution (high 8.2)
- [CVE-2026-45722](https://insights.sbomify.com/CVE-2026-45722/): Nextcloud: Tables app allows limited SQLi in ORDER BY with malicious sort order argument for Table Views (high 7.1)
- [CVE-2024-52511](https://insights.sbomify.com/CVE-2024-52511/): Nextcloud Tables has an Authorization Bypass Through User-Controlled Key in Tables (medium 6.3)
- [CVE-2026-45544](https://insights.sbomify.com/CVE-2026-45544/): Nextcloud: Information Disclosure of view filter metdata via Broken Sensitive Data Masking in ViewService (medium 4.3)
- [CVE-2025-66513](https://insights.sbomify.com/CVE-2025-66513/): Nextcloud Tables app share information not limited to relevant users (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-66551 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2025-66551 in the wild and no public exploit code.

Affected product: nextcloud security-advisories. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-66551/ (Markdown: https://insights.sbomify.com/CVE-2025-66551/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-66551
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66551
- OSV: https://osv.dev/vulnerability/CVE-2025-66551

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-66551/
Summaries are generated and may contain mistakes; the official description above is the record.