CVE-2020-8139 Missing authorization in Nextcloud Server

What is CVE-2020-8139?

CVE-2020-8139 is a medium-severity missing authorization vulnerability in Fedoraproject Fedora, published on 20 Mar 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A missing access control check in Nextcloud Server < 18.0.1, < 17.0.4, and < 16.0.9 causes hide-download shares to be downloadable when appending /download to the URL.

Weakness: CWE-862, CWE-284

Which versions are affected by CVE-2020-8139?

It affects 2 products.

Products include Fedoraproject Fedora, Nextcloud Nextcloud Server.

How do I fix CVE-2020-8139?

No fix has been published for CVE-2020-8139 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-2020-8139 being exploited?

There is no known exploitation of CVE-2020-8139 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

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

Also known as GHSA-3j4p-7g9x-w28j.