CVE-2021-41178: Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, a file traversal vulnerability makes an attacker…

PriorityP339medium6.5CVSS 3.1

AVNACLPRLUINSUCHINAN

EPSS

1.73%

74.7th percentile

Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, a file traversal vulnerability makes an attacker able to download arbitrary SVG images from the host system, including user provided files. This could also be leveraged into a XSS/phishing attack, an attacker could upload a malicious SVG file that mimics the Nextcloud login form and send a specially crafted link to victims. The XSS risk here is mitigated due to the fact that Nextcloud employs a strict Content-Security-Policy disallowing execution of arbitrary JavaScript. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
nextcloud	security-advisories	< 22.2.0	22.2.0
nextcloud	security-advisories	—	—
nextcloud	security-advisories	—	—
nextcloud	server	>= 20.0.3 < 20.0.13	20.0.13
nextcloud	server	>= 21.0.1 < 21.0.5	21.0.5
nextcloud	server	>= 22.1.1 < 22.2.0	22.2.0

CVSS provenance

nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

nvdv2.04.0MEDIUMAV:N/AC:L/Au:S/C:P/I:N/A:N

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