NextCloud security vulnerabilities

Nextcloud is an open source, self-hosted file synchronization and sharing communication application platform from Germany's Nextcloud. Nextcloud is vulnerable to a code execution vulnerability that stems from Nextcloud's support for rendering image previews of file content provided to users, whic...

Preview generation used third-party library not suited for user-generated content

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Secret Circle can be joined without approval

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Deck shared with a Circle can be accessed by non-Circle members

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File Drop can be bypassed using Richdocuments app

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Bypass of Two Factor Authentication

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Exceptions may have logged Encryption-at-Rest key content

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Lack of ratelimit on Richdocuments OCS endpoint

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XSS in Nextcloud Circles

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Nextcloud Text app can disclose existence of folders in "File Drop" link share

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Information Disclosure

nextcloud-desktop is vulnerable to informatino disclosure. The client fails to check if a private key belongs to previously downloaded public certificate. If the Nextcloud instance serves a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious...

Insecure Certificate Validation

Nextcloud Desktop Client is using an insecure certificate validation. It is possible due to lack of SSL certificate verification when using the "Register with a Provider" flow...

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 th...

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 th...

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 th...

Design/Logic Flaw

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 th...

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 th...

CVE-2021-37617

Summary of CVE-2021-37617 : The Nextcloud Desktop Client (Windows) contains a vendor- and user-controlled uninstall search path flaw. In versions 3.0.3 through 3.2.4, the client searches for an Uninstall.exe file in a folder writable by regular users. A malicious user could place a crafted Uninst...

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 th...

CVE-2021-37617 Untrusted Search Path in Nextcloud Desktop Client

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 th...