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Reflected XSS in OCS provider discovery

Platform: ownCloud Server

Versions: 7.0.12, 8.0.10, 8.1.5, 8.2.2,

Date: 1/6/2016

Risk level: Low

CVSS v2 Base Score: 4.3 (AV:N/AC:M/Au:N/C:P/I:N/A:N)

CWE: Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’) (CWE-79)


A Cross-site scripting (XSS) vulnerability in the OCS discovery provider in ownCloud Servers allows remote attackers to inject arbitrary web script or HTML via the URL resulting in a reflected Cross-Site-Scripting.

Since ownCloud employs a strict Content-Security-Policy that forbids inline script execution this bug is unlikely to be exploitable on recent browsers that support Content-Security-Policy. (Firefox >= 23, Chrome >= 25, Safari >= 7, Microsoft Edge)

Affected Software

Action Taken

The vulnerable component is now properly sanitizing the output.


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

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

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