Security Advisory

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

Description

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.

Resolution

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

Acknowledgements

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

• Frederik Braun - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.