CVE-2016-9464 Missing authorization in Nextcloud Server Nextcloud Server before 9.0.54 and 10.0.0

Medium 4.3 Published 28 Mar 2017 Updated 6 Aug 2024

Attackers can improperly remove shares for entire groups instead of just themselves, affecting Nextcloud Server users.

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-2016-9464?

CVE-2016-9464 is a medium-severity missing authorization vulnerability in Nextcloud Nextcloud Server, published on 28 Mar 2017. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares. The Sharing Backend as implemented in Nextcloud does differentiate between shares to users and groups. In case of a received group share, users should be able to unshare the file to themselves but not to the whole group. The previous API implementation simply unshared the file to all users in the group.

Weakness: CWE-285

Which versions are affected by CVE-2016-9464?

It affects 1 product.

Products include Nextcloud Nextcloud Server.

How do I fix CVE-2016-9464?

No fix has been published for CVE-2016-9464 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-2016-9464 being exploited?

There is no known exploitation of CVE-2016-9464 in the wild and no public exploit code.

All Nextcloud Nextcloud Server vulnerabilities

Sources

Also known as GHSA-r69w-pvjm-xg3v.