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OpenAdvisories
Medium · 5.4 CVE-2025-66512 EUVD-2025-201449

Nextcloud Server vulnerable to XSS in SVG images when opened outside of Nextcloud

Published Dec 5, 2025 · Updated Dec 5, 2025 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
nextcloud security-advisories >= 32.0.0beta1, < 32.0.3, < 31.0.12 —

Advisories 1

References