CVE-2025-66512

5.4 MEDIUM
Published: December 05, 2025 Modified: December 09, 2025
View on NVD

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5
Source: security-advisories@github.com
Patch Vendor Advisory
https://github.com/nextcloud/viewer/commit/5044a27d61bc40c0f134298d36af91f865335b63
Source: security-advisories@github.com
Patch
https://github.com/nextcloud/viewer/pull/3023
Source: security-advisories@github.com
Issue Tracking
https://hackerone.com/reports/3357808
Source: security-advisories@github.com
Issue Tracking Vendor Advisory

4 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.4 / 10.0
EPSS (Exploit Probability)
0.0%
4th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-80 CWE-79

Affected Vendors

nextcloud

Related CVEs

CVE-2025-52691 10.0
CVE-2025-15168 7.3
CVE-2025-15167 7.3
CVE-2025-15166 7.3
CVE-2025-15165 7.3