CVE-2025-66512

MEDIUM

Nextcloud Server <31.0.12-32.0.3 - Info Disclosure

Title source: llm

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.

References (4)

[Patch, Vendor Advisory] https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5

[Patch] https://github.com/nextcloud/viewer/commit/5044a27d61bc40c0f134298d36af91f865335b63

View Patch ZIP pw:eip

[Issue Tracking] https://github.com/nextcloud/viewer/pull/3023

[Issue Tracking, Vendor Advisory] https://hackerone.com/reports/3357808

Scores

CVSS v3 5.4

EPSS 0.0002

EPSS Percentile 5.9%

Attack Vector NETWORK

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

Classification

CWE

CWE-80 CWE-79

Status published

Affected Products (2)

nextcloud/nextcloud_server < 31.0.12

nextcloud/nextcloud_server < 31.0.12

Timeline

Published Dec 05, 2025

Tracked Since Feb 18, 2026