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Auth bypass in “user_webdavauth”

Platform: ownCloud Server

Versions: 4.5.13, 5.0.8,

Date: 7/9/2013

Risk level: Medium


A not further specified authentication bypass in the user_webdavauth application has been found. Using this vulnerability an attacker might login to the ownCloud instance without valid credentials.

Affected Software

  • ownCloud Server < 5.0.8 ()
  • ownCloud Server < 4.5.13 ()

Action Taken


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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