Main Vulnerability Database Vulnerabilities #VU141394

Improper access control in Nextcloud Server and Nextcloud Enterprise Server - CVE-2026-61527

Published: August 10, 2026

Vulnerability identifier: #VU141394

CSH Severity: Medium

CVSS v4: 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]

CVE-ID: CVE-2026-61527

CWE-ID: CWE-284

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

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.

Affected software

Nextcloud Server
Nextcloud Enterprise Server

How to mitigate CVE-2026-61527

Install updates from vendor's website.

Nextcloud Server - addressed in versions 32.0.12, 33.0.6, 34.0.1
Nextcloud Enterprise Server - addressed in versions 32.0.12, 33.0.6

External References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-99gw-ww6p-f2rr

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