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<h1>Security Advisory</h1>
<a href="/security/advisories/">Back to advisories</a>
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<h2>XSS in Files PDF viewer (NC-SA-2020-019)</h2>
<p>18th March 2020</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:N/I:L/A:N">AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N</a>)</p>
<p>CWE: <a href="https://cwe.mitre.org/data/definitions/79.html">Cross-site Scripting (XSS) - Generic (CWE-79)</a></p>
<p>HackerOne report: <a href="https://hackerone.com/reports/819863">819863</a></p>
<h3>Description</h3>
<p>An outdated 3rd party library in the Files PDF viewer for Nextcloud Server 18.0.2 caused a Cross-site scripting vulnerability when opening a malicious PDF.</p>
<h3>Affected Software</h3>
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<li>Nextcloud Server < <strong>18.0.3</strong> (CVE-2020-8155)</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 18.0.3.</p>
<h3>Acknowledgements</h3>
<p>The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:</p>
<ul>
<li><a href="https://tripplyons.com/" target="_blank" rel="noreferrer">Tripp Lyons (tripplyons@gmail.com) - 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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