Low severity · published Jun 1, 2026
CVE-2026-45266
Nextcloud: Unauthorized force-mute from missing permission check when using internal signaling
3.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · nextcloud
< 21.1.10; < 22.0.11; < 23.0.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45266
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45266
github.com
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x75r-65hm-cw35
github.com
https://github.com/nextcloud/spreed/pull/17577
hackerone.com
https://hackerone.com/reports/3636758
More from security-advisories
9.8
CVE-2024-22212
Nextcloud global site selector authentication bypass
9.8
CVE-2023-49792
Bruteforce protection can be bypassed with misconfigured proxy
9.8
CVE-2023-48307
Nextcloud Mail app vulnerable to Server-Side Request Forgery
9.8
CVE-2023-48306
Nextcloud Server DNS pin middleware can be tricked into DNS rebinding allowing SSRF
9.8
CVE-2023-32074
Nextcloud user_oidc app is missing brute force protection