CVE-2021-32653 Default settings leak federated cloud ID to lookup server of all users
Nextcloud Server leaks user IDs to lookup servers even when users have no published fields, exposing identity information.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-32653?
CVE-2021-32653 is a low-severity vulnerability in Nextcloud Nextcloud Server, published on 1 Jun 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server versions prior to 19.0.11, 20.0.10, or 21.0.2 send user IDs to the lookup server even if the user has no fields set to published. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2; no workarounds outside the updates are known to exist.
Weakness: CWE-201
Which versions are affected by CVE-2021-32653?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2021-32653?
No fix has been published for CVE-2021-32653 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-32653 being exploited?
There is no known exploitation of CVE-2021-32653 in the wild and no public exploit code.
Other vulnerabilities in Nextcloud Nextcloud Server
- CVE-2021-32802 Preview generation used third-party library not suited for user-generated content in Nextcloud server
- CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server
- CVE-2018-3775 Auth bypass in Nextcloud Server
- CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected
- CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended
Sources
Also known as GHSA-396j-vqpr-qg45.