Vulnerability DatabaseCVE-2025-66512
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CVE-2025-66512
December 05, 2025
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.
Affected Packages
https://github.com/nextcloud/viewer.git (GITHUB):
Affected version(s) >=v32.0.0beta1 <v32.0.3
Fix Suggestion:
Update to version v32.0.3
https://github.com/nextcloud/viewer.git (GITHUB):
Affected version(s) >=v31.0.0beta1 <v31.0.12
Fix Suggestion:
Update to version v31.0.12
Related Resources (4)
https://github.com/nextcloud/viewer/pull/3023
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5
https://github.com/nextcloud/viewer/commit/5044a27d61bc40c0f134298d36af91f865335b63
https://hackerone.com/reports/3357808
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CVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-79
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-80
EPSS
Base Score:
0.02