CVE-2016-9462 Missing authorization in Nextcloud Server & ownCloud Server Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4

What is CVE-2016-9462?

CVE-2016-9462 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 9.0.52 & ownCloud Server before 9.0.4 are not properly verifying restore privileges when restoring a file. The restore capability of Nextcloud/ownCloud was not verifying whether a user has only read-only access to a share. Thus a user with read-only access was able to restore old versions.

Weakness: CWE-284, CWE-275

Which versions are affected by CVE-2016-9462?

It affects 2 products.

Products include Nextcloud Nextcloud Server, Owncloud Owncloud.

How do I fix CVE-2016-9462?

No fix has been published for CVE-2016-9462 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-2016-9462 being exploited?

There is no known exploitation of CVE-2016-9462 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 Critical 9.3
• CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server Critical 9.1
• CVE-2018-3775 Auth bypass in Nextcloud Server High 8.8
• CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected High 8.7
• CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended High 8.7

All Nextcloud Nextcloud Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-xfx5-6q2x-cp8j.