CVE-2020-8189 Cross-site scripting in Desktop Client
An attacker can inject HTML or local links via invalid login responses in the Nextcloud Desktop Client, potentially leading to code execution or security bypass.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-8189?
CVE-2020-8189 is a medium-severity cross-site scripting vulnerability in Desktop Client, published on 21 Aug 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A cross-site scripting error in Nextcloud Desktop client 2.6.4 allowed to present any html (including local links) when responding with invalid data on the login attempt.
Weakness: CWE-79
Which versions are affected by CVE-2020-8189?
It affects 1 product.
Products include Nextcloud Desktop.
How do I fix CVE-2020-8189?
Upgrade to a fixed version.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2020-8189 being exploited?
There is no known exploitation of CVE-2020-8189 in the wild and no public exploit code.
Other vulnerabilities in Desktop Client
- CVE-2024-46958 Misconfiguration in n/a
- CVE-2020-8224 Code injection in Desktop Client
- CVE-2020-8225 Information disclosure in Desktop Client
- CVE-2021-37617 Untrusted Search Path in Nextcloud Desktop Client
- CVE-2023-28999 Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders
Sources
Also known as DEBIAN-CVE-2020-8189, GHSA-vc58-g8xx-fx3p, UBUNTU-CVE-2020-8189.