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Stored XSS in autocomplete suggestions for chat @-mentions (NC-SA-2018-009)

10th August 2018

Risk level: Low

CVSS v3 Base Score: 0 (AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:N)

CWE: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CWE-79)


A missing sanitization of search results for an autocomplete field could lead to a stored XSS requiring user-interaction. The missing sanitization only affected user names, hence malicious search results could only be crafted by authenticated users.

Affected Software

  • Nextcloud Talk < 3.2.5 (CVE-2018-3781)

Action Taken

The error has been fixed.


It is recommended that the Talk app is upgraded to 3.2.5.


The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:

  • Joas Schilling - Nextcloud GmbH ( - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.

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