CVE-2022-39331: Cross-site Scripting (XSS) in Nexcloud Desktop Client

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-11-25 · updated 2026-06-17
Weakness: CWE-79

Description

Nexcloud desktop is the Desktop sync client for Nextcloud. An attacker can inject arbitrary HyperText Markup Language into the Desktop Client application in the notifications. It is recommended that the Nextcloud Desktop client is upgraded to 3.6.1. There are no known workarounds for this issue.

Affected products

Desktop Client: before 3.6.1 — fixed in 3.6.1

How to fix

Upgrade to a fixed version: Desktop Client 3.6.1. Check the vendor advisory for mitigations.

References

https://github.com/nextcloud/desktop/pull/4944
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-c3xh-q694-6rc5
https://hackerone.com/reports/1668028
https://github.com/nextcloud/desktop/pull/4944
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-c3xh-q694-6rc5
https://hackerone.com/reports/1668028
https://lists.debian.org/debian-lts-announce/2025/09/msg00018.html

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