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

Description

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 23.0.3.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x75r-65hm-cw35
• https://github.com/nextcloud/spreed/pull/17577
• https://hackerone.com/reports/3636758