CVE-2025-66551

Name: CVE-2025-66551
Creator: NVD / NIST
Published: 2025-12-05T18:15:58.3+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2025-66551 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.21%

10.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-639

Affected Software

Vendor	Product	Versions
Nextcloud	Tables	>= 0.4.0, < 0.8.6
Nextcloud	Tables	>= 0.9.0, < 0.9.3

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-w787-vwqp-8wr7Vendor Advisory
https://github.com/nextcloud/tables/commit/39f24a62fb41fd7a8bda65325f8bbafdc91c731cPatch
https://github.com/nextcloud/tables/pull/1810Issue Tracking, Patch
https://hackerone.com/reports/3137895Issue Tracking, Vendor Advisory

Timeline

Published: Dec 5, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-66551?

How severe is CVE-2025-66551?

CVE-2025-66551 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2025-66551?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-66551?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST