SB2026081040 - Improper access control in Nextcloud Server and Enterprise Server
Published: August 10, 2026
Security Bulletin ID
SB2026081040
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-61527)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to the logic issue broke the permissions restrictions on link shares. A remote user can bypass implemented security restrictions and gain full write permissions to the contents of the share.
Remediation
Install update from vendor's website.