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CVE-2025-66547

Good to know:

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Date: December 5, 2025

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.

Severity Score

Related Resources (7)

https://nvd.nist.gov/vuln/detail/CVE-2025-66547
https://github.com/nextcloud/server/pull/51288
https://github.com/nextcloud/server/issues/51247
https://hackerone.com/reports/3040887
https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2
https://www.mend.io/vulnerability-database/CVE-2025-66547

Severity Score

Weakness Type (CWE)

Authorization Bypass Through User-Controlled Key

CWE-639

Top Fix

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Upgrade Version

Upgrade to version https://github.com/nextcloud/server.git - v31.0.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

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