CVE-2020-8633 Missing authorization in n/a

Medium 5.3 Published 18 Feb 2020 Updated 4 Aug 2024

Revoked shared calendars remain accessible in Outlook, allowing unauthorized users to read calendar data.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-8633?

CVE-2020-8633 is a medium-severity missing authorization vulnerability in Synacor Zimbra Collaboration Suite, published on 18 Feb 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7. When grantors revoked a shared calendar in Outlook, the calendar stayed mounted and accessible.

Weakness: CWE-281

Which versions are affected by CVE-2020-8633?

It affects 1 product.

Products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2020-8633?

No fix has been published for CVE-2020-8633 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-2020-8633 being exploited?

There is no known exploitation of CVE-2020-8633 in the wild and no public exploit code.

All Synacor Zimbra Collaboration Suite vulnerabilities

Sources

Also known as GHSA-j9q2-5fvv-rjgp.