Description
Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Server Enterprise prior to 31.0.12 and 32.0.3, a missing sanitization allowed malicious users to circumvent the content security policy when a malicious user manages to trick a user it viewing an uploaded SVG outside of the Nextcloud Servers web page.
Published: 2025-12-05
Score: 5.4 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 09 Dec 2025 16:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-79
CPEs cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*

Fri, 05 Dec 2025 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Nextcloud
Nextcloud nextcloud
Nextcloud nextcloud Enterprise Server
Nextcloud nextcloud Server
Nextcloud server
Vendors & Products Nextcloud
Nextcloud nextcloud
Nextcloud nextcloud Enterprise Server
Nextcloud nextcloud Server
Nextcloud server

Fri, 05 Dec 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 05 Dec 2025 16:30:00 +0000

Type Values Removed Values Added
Description Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Server Enterprise prior to 31.0.12 and 32.0.3, a missing sanitization allowed malicious users to circumvent the content security policy when a malicious user manages to trick a user it viewing an uploaded SVG outside of the Nextcloud Servers web page.
Title Nextcloud Server vulnerable to XSS in SVG images when opened outside of Nextcloud
Weaknesses CWE-80
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L'}


Subscriptions

Nextcloud Nextcloud Nextcloud Enterprise Server Nextcloud Server Server
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-12-05T20:05:05.069Z

Reserved: 2025-12-03T15:28:02.992Z

Link: CVE-2025-66512

cve-icon Vulnrichment

Updated: 2025-12-05T20:04:56.889Z

cve-icon NVD

Status : Analyzed

Published: 2025-12-05T17:16:04.980

Modified: 2025-12-09T16:38:19.160

Link: CVE-2025-66512

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-12-05T20:56:04Z

Weaknesses