CVE-2021-32733 Information

Description

Nextcloud Text is a collaborative document editing application that uses Markdown. A cross-site scripting vulnerability is present in versions prior to 19.0.13 20.0.11 and 21.0.3. The Nextcloud Text application shipped with Nextcloud server used a text/html Content-Type when serving files to users. Due the strict Content-Security-Policy shipped with Nextcloud this issue is not exploitable on modern browsers supporting Content-Security-Policy. The issue was fixed in versions 19.0.13 20.0.11 and 21.0.3. As a workaround use a browser that has support for Content-Security-Policy.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Reference

https://hackerone.com/reports/1241460 https://github.com/nextcloud/text/pull/1689 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x4w3-jhcr-57pq

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1