What is the CVSS score of CVE-2025-66551?

CVE-2025-66551 has a CVSS 3.1 base score of 6.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L. EPSS exploitation probability: 0.0%.

Which versions of Tables are affected by CVE-2025-66551?

Organizations using Nextcloud Tables should be aware of moderate risk from CVE-2025-66551, a IDOR vulnerability rated CVSS 6.3. Exploitation could compromise the security of affected deployments.. A patch is available.

How to fix or mitigate CVE-2025-66551?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Tables CVE-2025-66551

EUVD-2025-201440 MEDIUM

Authorization Bypass Through User-Controlled Key (CWE-639)

2025-12-05 security-advisories@github.com

Authentication Bypass Tables Nextcloud

6.3

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.3 MEDIUM

AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

Low

Lifecycle Timeline

EUVD ID Assigned

Mar 15, 2026 - 17:08 euvd

EUVD-2025-201440

Analysis Generated

Mar 15, 2026 - 17:08 vuln.today

Patch released

Mar 15, 2026 - 17:08 nvd

Patch available

CVE Published

Dec 05, 2025 - 18:15 nvd

MEDIUM 6.3

DescriptionGitHub Advisory

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.