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Privilege escalation in the contacts application

Platform: ownCloud Server

Versions: 4.5.10, 5.0.5,

Date: 4/19/2013

Risk level: Medium


Due to not properly checking the ownership of a single contact, an authenticated attacker is able to download contacts of other users in all ownCloud versions prior to 5.0.5 including the 4.5.x branch.

Note: Successful exploitation of this privilege escalation requires the “contacts” app to be enabled (enabled by default).

Affected Software

  • ownCloud Server < 5.0.5 (CVE-2013-1963)
  • ownCloud Server < 4.5.10 (CVE-2013-1963)

Action Taken

It is recommended that all instances are upgraded to ownCloud Server 5.0.5 or 4.5.10.


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

  • Lukas Reschke – ownCloud Inc. (lukas@owncloud.org) – Vulnerability discovery and disclosure.

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