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Reflected XSS in svg logo generation (NC-SA-2019-018)

2nd August 2019

Risk level: Low

CVSS v3 Base Score: 6.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)

CWE: Cross-site Scripting (XSS) - Reflected (CWE-79)

HackerOne report: 605915


A reflected Cross-Site Scripting vunerability was discovered in the svg generation.

Affected Software

  • Nextcloud Server < 16.0.2 (CVE-2020-8120)
  • Nextcloud Server < 15.0.9 (CVE-2020-8120)
  • Nextcloud Server < 14.0.13 (CVE-2020-8120)

Action Taken

The error has been fixed.


It is recommended that all instances are upgraded to Nextcloud 16.0.2, 15.0.9 or 14.0.13.


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

This advisory is licensed CC BY-SA 4.0.

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