SB2025120820 - Authorization bypass through user-controlled key in Nextcloud Calendar
Published: December 8, 2025
Security Bulletin ID
SB2025120820
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Authorization bypass through user-controlled key (CVE-ID: CVE-2025-66546)
The vulnerability allows a local user to compromise the target system.
The vulnerability exists due to the affected application allows booking appointments without the generated token. A local user can gain access to sensitive information on the system.
Remediation
Install update from vendor's website.