title: XSS in Talk
description: Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Talk application was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Talk application is upgraded to patched versions 10.0.7, 10.1.4, 11.1.2, 11.2.0 or 12.0.0. As a workaround, use a browser that has support for Content-Security-Policy.
problem types: CWE-434: Unrestricted Upload of File with Dangerous Type
affected:
{
product: security-advisories
vendor: nextcloud
versions:
status: affected, version: < 10.0.7
status: affected, version: >= 10.1.0, < 10.1.4
status: affected, version: >= 11.1.0, < 11.1.2
status: affected, version: < 11.2.0
status: affected, version: >= 12.0.0.alpha-1, < 12.0.0
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 6.4
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
version: 3.1
]