Security fix · CVE-2026-45266
Nextcloud is an open source content collaboration platform.
Published Jun 1, 2026 · catalog updated Jul 22, 2026 · Nextcloud is an open
Check if you run it
No confirmed exploitation is on record for CVE-2026-45266. EPSS is 0.35%. Act only if a listed version of Nextcloud is an open is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (Nextcloud is an open).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Low3.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.35%
- Remediation
- Advisory link
- Affected products
- See sources for product scope
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.
No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.
How to fix CVE-2026-45266
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-45266. EPSS is 0.35%. Act only if a listed version of Nextcloud is an open is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-284: Improper Access Control. EPSS 0.35%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Jun 1, 2026 · NIST NVD
Detected
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.
Jul 22, 2026 · NIST NVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2026-45266
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-45266
30-day exploitation probability 0.4%
first.org - NIST NVDVulnerability recordCVE-2026-45266
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
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.