Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

CVE-2025-66512

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

2025-12-05T17:16:04.980

Last Modified

2025-12-09T16:38:19.160

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 5.4 (MEDIUM)

Weaknesses

Type: Secondary
CWE-80
Type: Primary
CWE-79

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	nextcloud	nextcloud_server	< 31.0.12	Yes
Application	nextcloud	nextcloud_server	< 31.0.12	Yes
Application	nextcloud	nextcloud_server	< 32.0.3	Yes
Application	nextcloud	nextcloud_server	< 32.0.3	Yes

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5 Patch, Vendor Advisory ([email protected])
https://github.com/nextcloud/viewer/commit/5044a27d61bc40c0f134298d36af91f865335b63 Patch ([email protected])
https://github.com/nextcloud/viewer/pull/3023 Issue Tracking ([email protected])
https://hackerone.com/reports/3357808 Issue Tracking, Vendor Advisory ([email protected])