CVE-2019-15621 Missing authorization in Nextcloud Server
Sharees can improperly reshare received mount points as public links with write permissions, allowing unauthorized data modification.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-15621?
CVE-2019-15621 is a medium-severity missing authorization vulnerability in Nextcloud Nextcloud Server, published on 4 Feb 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Improper permissions preservation in Nextcloud Server 16.0.1 causes sharees to be able to reshare with write permissions when sharing the mount point of a share they received, as a public link.
Weakness: CWE-281
Which versions are affected by CVE-2019-15621?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2019-15621?
Upgrade to a fixed version.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2019-15621 being exploited?
There is no known exploitation of CVE-2019-15621 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-jchm-73f8-w72j.