CVE-2026-45266

Nextcloud vulnerability CVE-2026-45266 affects the internal signaling path in Nextcloud’s collaboration platform. A low-privileged user can force other users’ microphones to be muted in calls when no High-performance Backend is installed. Root causes appear to be missing permission checks during ...

CVE-2026-45266 Nextcloud: Unauthorized force-mute from missing permission check when using internal signaling

Nextcloud is an open source content collaboration platform. Prior to versions 21.1.10, 22.0.11, and 23.0.3, a low-privileged user can force other user's microphones to be muted in calls when no High-performance Backend is installed. This issue has been patched in versions 21.1.10, 22.0.11, and...

Unauthorized force-mute from missing permission check when using internal signaling

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Nextcloud: Cross-room signaling injection enabling unauthorized force-mute

A cross-room signaling injection vulnerability was identified in the Talk application that allowed a low-privileged participant to inject moderator-only internal-signaling control messages into a victim's session. The vulnerability exploited the fact that the server checked moderator permissions...