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<h1>Security Advisory</h1>
<a href="/security/advisories/">Back to advisories</a>
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<h2>Improper validation on OAuth2 token endpoint (NC-SA-2018-003)</h2>
<p>21st June 2018</p>
<p>Risk level: <strong>Medium</strong></p>
<p>CVSS v3 Base Score: 6.4 (<a href="https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N">AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N</a>)</p>
<p>CWE: <a href="https://cwe.mitre.org/data/definitions/20.html">Improper Input Validation (CWE-20)</a></p>
<p>HackerOne report: <a href="https://hackerone.com/reports/343111">343111</a></p>
<h3>Description</h3>
<p>Improper validation of input allowed an attacker with access to the OAuth2 refresh token to obtain new tokens.</p>
<h3>Affected Software</h3>
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<li>Nextcloud Server < <strong>13.0.3</strong> (CVE-2018-3761)</li>
<li>Nextcloud Server < <strong>12.0.8</strong> (CVE-2018-3761)</li>
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<h3>Action Taken</h3>
<p>The error has been fixed according to RFC6749.</p>
<h3>Resolution</h3>
<p>It is recommended that all instances are upgraded to Nextcloud 13.0.3.</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>Mikael Karlsson - 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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