CVE-2025-66547

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

N

extcloud 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.

References

Link	Resource
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2	Patch Vendor Advisory
https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9	Patch
https://github.com/nextcloud/server/issues/51247	Issue Tracking
https://github.com/nextcloud/server/pull/51288	Issue Tracking
https://hackerone.com/reports/3040887	Permissions Required Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:nextcloud:nextcloud_server:::::-:::*
	cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::*

History

09 Dec 2025, 16:31

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-12-05 17:16

Updated : 2025-12-09 16:31

NVD link : CVE-2025-66547

Mitre link : CVE-2025-66547

CVE.ORG link : CVE-2025-66547

JSON object : View

Products Affected

nextcloud_server

CWE

CWE-639

Authorization Bypass Through User-Controlled Key

{"id": "CVE-2025-66547", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "[email protected]", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.8}]}, "published": "2025-12-05T17:16:05.330", "references": [{"url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2", "tags": ["Patch", "Vendor Advisory"], "source": "[email protected]"}, {"url": "https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9", "tags": ["Patch"], "source": "[email protected]"}, {"url": "https://github.com/nextcloud/server/issues/51247", "tags": ["Issue Tracking"], "source": "[email protected]"}, {"url": "https://github.com/nextcloud/server/pull/51288", "tags": ["Issue Tracking"], "source": "[email protected]"}, {"url": "https://hackerone.com/reports/3040887", "tags": ["Permissions Required", "Vendor Advisory"], "source": "[email protected]"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-639"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2025-12-09T16:31:38.237", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "D8631F6B-EED4-4B47-84C3-7BC63464AC15", "versionEndExcluding": "31.0.1", "versionStartIncluding": "31.0.0"}, {"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*", "vulnerable": true, "matchCriteriaId": "52B7D78F-BCCC-4178-BB21-AB9587D11386", "versionEndExcluding": "31.0.1", "versionStartIncluding": "31.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "[email protected]"}