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<h1>Security Advisory</h1>
<a href="/security/advisories/">Back to advisories</a>
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<h2>Calendar and addressbook names disclosed (NC-SA-2017-012)</h2>
<p>8th May 2017</p>
<p>Risk level: <strong>Low</strong></p>
<p>CVSS v3 Base Score: 3.5 (<a href="https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N">AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N</a>)</p>
<p>CWE: <a href="https://cwe.mitre.org/data/definitions/548.html">Information Exposure Through Directory Listing (CWE-548)</a></p>
<p>HackerOne report: <a href="https://hackerone.com/reports/203594">203594</a></p>
<h3>Description</h3>
<p>A logical error caused disclosure of calendar and addressbook names to other logged-in users. Note that no actual content of the calendar and adressbook has been disclosed.</p>
<h3>Affected Software</h3>
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<li>Nextcloud Server < <strong>11.0.2</strong> (CVE-2017-0895)</li>
<li>Nextcloud Server < <strong>10.0.4</strong> (CVE-2017-0895)</li>
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<h3>Action Taken</h3>
<p>The error has been fixed and regression tests been added.</p>
<h3>Resolution</h3>
<p>It is recommended that all instances are upgraded to Nextcloud 11.0.3.</p>
<h3>Acknowledgements</h3>
<p>The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:</p>
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<li><a href="https://juliushaertl.de" target="_blank" rel="noreferrer">Julius Härtl - Vulnerability discovery and disclosure.</a></li>
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<small style="color:grey">This advisory is licensed <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.</small>
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