CVE-2020-16969 Microsoft Exchange Information Disclosure Vulnerability
An attacker can exploit token validation flaws in Microsoft Exchange to disclose user information via specially crafted OWA messages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-16969?
CVE-2020-16969 is a high-severity vulnerability in Microsoft Exchange Server, published on 16 Oct 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
<p>An information disclosure vulnerability exists in how Microsoft Exchange validates tokens when handling certain messages. An attacker who successfully exploited the vulnerability could use this to gain further information from a user.</p> <p>To exploit the vulnerability, an attacker could include specially crafted OWA messages that could be loaded, without warning or filtering, from the attacker-controlled URL. This callback vector provides an information disclosure tactic used in web beacons and other types of tracking systems.</p> <p>The security update corrects the way that Exchange handles these token validations.</p>
Which versions are affected by CVE-2020-16969?
It affects 1 product.
Products include Microsoft Exchange Server.
How do I fix CVE-2020-16969?
No fix has been published for CVE-2020-16969 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-16969 being exploited?
There is no known exploitation of CVE-2020-16969 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Exchange Server
- CVE-2024-21410 Microsoft Exchange Server Privilege Escalation
- CVE-2021-34473 Microsoft Exchange Server Remote Code Execution
- CVE-2021-26855 Microsoft Exchange Server Remote Code Execution
- CVE-2021-34523 Microsoft Exchange Server Privilege Escalation
- CVE-2023-21529 Microsoft Exchange Server Deserialization of Untrusted Data
Sources
Also known as GHSA-hx67-2mh4-8cj2.