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Auth bypass in index.php

Platform: ownCloud Server

Versions: 4.0.7,

Date: 7/10/2012

Risk level: High


index.php before ownCloud 4.0.7 does not properly validate the oc_token cookie, which allows remote attackers to bypass authentication via a crafted oc_token cookie value.

Affected Software

  • ownCloud Server < 4.0.7 (CVE-2012-4392)

Action Taken

It is recommended that all instances are upgraded to ownCloud Server 4.0.7.


The ownCloud team thanks the following people for their research and responsible disclosure of the above advisory:

  • Julien Cayssol – Vulnerability discovery and disclosure.

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