CVE-2025-66512
Nextcloud Server vulnerable to XSS in SVG images when opened outside of Nextcloud
- State
- Published
- Severity
- 5.4 Medium
- Published
- Dec 5, 2025
- Updated
- Dec 5, 2025
- Reserved
- Dec 3, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.4 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L | GitHub_M |
Weaknesses
- CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Affected Products
| Product | Versions |
|---|---|
security-advisoriesnextcloud |
|
References
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