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<h1>Security Advisory</h1>
<a href="/security/advisories/">Back to advisories</a>
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<h2>Removing emails from circles does not revoke access to shared items (NC-SA-2019-013)</h2>
<p>6th October 2019</p>
<p>Risk level: <strong>Low</strong></p>
<p>CVSS v3 Base Score: 2 (<a href="https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N">AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N</a>)</p>
<p>CWE: <a href="https://cwe.mitre.org/data/definitions/285.html">Improper Authorization (CWE-285)</a></p>
<p>HackerOne report: <a href="https://hackerone.com/reports/673724">673724</a></p>
<h3>Description</h3>
<p>Improper authorization in the Circles app 0.17.7 causes retaining access when an email address was removed from a circle.</p>
<h3>Affected Software</h3>
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<li>Nextcloud Circles < <strong>0.17.8</strong> (CVE-2019-15610)</li>
<li>Nextcloud Circles < <strong>0.16.11</strong> (CVE-2019-15610)</li>
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<h3>Action Taken</h3>
<p>The error has been fixed.</p>
<h3>Resolution</h3>
<p>It is recommended that the Circles app is upgraded to 0.17.8.</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>michag86 - Vulnerability discovery and disclosure.</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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