Security Advisory

CVE-2025-66514

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2025-12-05 17:32:25

Last updated 2025-12-08 20:10:21

Assigner GitHub_M

State PUBLISHED

Description

Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. Prior to 5.5.3, a stored HTML injection in the Mail apps message list allowed an authenticated user to inject HTML into the email subjects. Javascript was correctly blocked by the content security policy of the Nextcloud Server code.

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