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<h1>Security Advisory</h1>
<a href="/security/advisories/">Back to advisories</a>
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<h2>Server-Side request forgery in New-Subscription feature of the calendar app (NC-SA-2019-014)</h2>
<p>4th July 2019</p>
<p>Risk level: <strong>Low</strong></p>
<p>CVSS v3 Base Score: 5 (<a href="https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N">AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N</a>)</p>
<p>CWE: <a href="https://cwe.mitre.org/data/definitions/918.html">Server-Side Request Forgery (CWE-918)</a></p>
<p>HackerOne report: <a href="https://hackerone.com/reports/427835">427835</a></p>
<h3>Description</h3>
<p>An authenticated server-side request forgery in Nextcloud server 16.0.1 allowed to detect local and remote services when adding a new subscription in the calendar application.</p>
<h3>Affected Software</h3>
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<li>Nextcloud Server < <strong>16.0.2</strong> (CVE-2020-8118)</li>
<li>Nextcloud Server < <strong>15.0.9</strong> (CVE-2020-8118)</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 Nextcloud server is upgraded to 16.0.2.</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://security-consulting.icu/blog/" target="_blank" rel="noreferrer">Tim Coen - 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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