CVE-2026-45266 Nextcloud: Unauthorized force-mute from missing permission check when using internal signaling
Low-privileged users can force-mute other participants in Nextcloud calls due to missing permission checks when internal signaling is used.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-45266?
CVE-2026-45266 is a low-severity missing authorization vulnerability in nextcloud security-advisories, published on 1 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-284
Which versions are affected by CVE-2026-45266?
How do I fix CVE-2026-45266?
No fix has been published for CVE-2026-45266 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-45266 being exploited?
There is no known exploitation of CVE-2026-45266 in the wild and no public exploit code.
Sources
Also known as GHSA-x75r-65hm-cw35.