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<h1>Security Advisory</h1>
<a href="/security/advisories/">Back to advisories</a>
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<h2>Reflected XSS in error pages (NC-SA-2017-008)</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/79.html">Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CWE-79)</a></p>
<p>HackerOne report: <a href="https://hackerone.com/reports/216812">216812</a></p>
<h3>Description</h3>
<p>Inadequate escaping of error messages leads to XSS vulnerabilities in multiple components.Note that Nextcloud employs a strict Content-Security-Policy preventing exploitation of this XSS issue on modern web browsers.</p>
<h3>Affected Software</h3>
<ul>
<li>Nextcloud Server < <strong>11.0.3</strong> (CVE-2017-0891)</li>
<li>Nextcloud Server < <strong>10.0.5</strong> (CVE-2017-0891)</li>
<li>Nextcloud Server < <strong>9.0.58</strong> (CVE-2017-0891)</li>
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<h3>Action Taken</h3>
<p>Error messages are now properly escaped.</p>
<h3>Resolution</h3>
<p>It is recommended that all instances are upgraded to Nextcloud 9.0.58, 10.0.5 or 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>
<ul>
<li><a href="https://twitter.com/sinkmanu" target="_blank" rel="noreferrer">Manuel Mancera - 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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