PT-2026-45476 · Nextcloud · Nextcloud

Brumbelow · CVE-2026-45266 · Published 2026-06-01 · Updated 2026-06-01

Positive Technologies (AI Summary)

CVSS v3.1

3.5

Low

Base vector

AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Nextcloud versions prior to 21.1.10 Nextcloud versions prior to 22.0.11 Nextcloud versions prior to 23.0.3

Description A low-privileged user can force the microphones of other users to be muted during calls. This occurs due to a missing permission check when using internal signaling in environments where no High-performance Backend is installed.

Recommendations Update to version 21.1.10. Update to version 22.0.11. Update to version 23.0.3.

Exploit

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

CVE-2026-45266

GHSA-X75R-65HM-CW35

Affected Products

Nextcloud

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45266.json · Exploit
• https://osv.dev/vulnerability/CVE-2026-45266 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-45266 · Security Note
• https://github.com/nextcloud/spreed/pull/17577 · Note
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x75r-65hm-cw35 · Note
• https://hackerone.com/reports/3636758 · Note
• https://t.me/CVEtracker/55512 · Telegram Post