CVE-2018-8927 Missing authorization in Calendar

Medium 5.4 Published 14 Jun 2018 Updated 16 Sep 2024

Authenticated users can create arbitrary calendar events by manipulating parameters, requiring an upgrade to Synology Calendar.

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-2018-8927?

CVE-2018-8927 is a medium-severity missing authorization vulnerability in Synology Calendar, published on 14 Jun 2018. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Improper authorization vulnerability in SYNO.Cal.Event in Calendar before 2.1.2-0511 allows remote authenticated users to create arbitrary events via the (1) cal_id or (2) original_cal_id parameter.

Weakness: CWE-863

Which versions are affected by CVE-2018-8927?

It affects 1 product.

Products include Synology Calendar.

How do I fix CVE-2018-8927?

No fix has been published for CVE-2018-8927 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-2018-8927 being exploited?

There is no known exploitation of CVE-2018-8927 in the wild and no public exploit code.

Sources

Also known as GHSA-pc82-888m-pq3g.