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CVE

CWE

Training

CVE-2025-66512

Published: Dec 5, 2025

Modified: Dec 5, 2025

PUBLISHED

CVSS v3.1

5.4

MEDIUM

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.

Vendor	Product	Versions
nextcloud	security-advisories	affected `>= 32.0.0beta1, < 32.0.3` affected `< 31.0.12`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5

x_refsource_CONFIRM

https://github.com/nextcloud/viewer/pull/3023

x_refsource_MISC

https://github.com/nextcloud/viewer/commit/5044a27d61bc40c0f134298d36af91f865335b63

x_refsource_MISC

https://hackerone.com/reports/3357808

x_refsource_MISC

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