CVE-2018-3762 Missing authorization in Nextcloud Server
Attackers can access file previews for shared files they no longer have permission to view due to improper permission checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-3762?
CVE-2018-3762 is a medium-severity missing authorization vulnerability in Nextcloud Nextcloud Server, published on 5 Jul 2018. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Nextcloud Server before 12.0.8 and 13.0.3 suffers from improper checks of dropped permissions for incoming shares allowing a user to still request previews for files it should not have access to.
Which versions are affected by CVE-2018-3762?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2018-3762?
No fix has been published for CVE-2018-3762 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2018-3762 being exploited?
There is no known exploitation of CVE-2018-3762 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-6p7m-f494-cjvp.