CVE-2025-66512

CWE-80CWE-79 — Cross-site Scripting (XSS)2 documents2 sources
Severity
6.1MEDIUM
EPSS
0.0%
top 91.17%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Nextcloud Security-advisoriesNextcloud Nextcloud Server
Timeline
PublishedDec 5

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:LExploitability: 2.8 | Impact: 2.5

Affected Packages2 packages

▶NVDnextcloud/nextcloud_server31.0.0 — 31.0.12+1
▶CVEListV5nextcloud/security-advisories< 31.0.12+1

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

1
CVEList
Nextcloud Server vulnerable to XSS in SVG images when opened outside of Nextcloud↗2025-12-05
▶
CVE-2025-66512 (MEDIUM CVSS 6.1) | Nextcloud Server is a self hosted p | cvebase.io