CVE-2021-37617

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. The Nextcloud Desktop Client invokes its uninstaller script when being installed to make sure there are no remnants of previous installations. In versions 3.0.3 through 3.2.4, the Client searches the `Uninstall.exe` file in a folder that can be written by regular users. This could lead to a case where a malicious user creates a malicious `Uninstall.exe`, which would be executed with administrative privileges on the Nextcloud Desktop Client installation. This issue is fixed in Nextcloud Desktop Client version 3.3.0. As a workaround, do not allow untrusted users to create content in the `C:\` system folder and verify that there is no malicious `C:\Uninstall.exe` file on the system.

• CWE-426
• CWE-427

• https://github.com/nextcloud/desktop/pull/3497Patch, Third Party Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q2w-v879-q24vThird Party Advisory
• https://hackerone.com/reports/1240749Permissions Required, Third Party Advisory
• https://github.com/nextcloud/desktop/pull/3497Patch, Third Party Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q2w-v879-q24vThird Party Advisory
• https://hackerone.com/reports/1240749Permissions Required, Third Party Advisory

Published

Aug 18, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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