CVE-2020-0903 Cross-site scripting in Microsoft Exchange Server 2016 Cumulative Update 14
Attackers can execute arbitrary scripts in user browsers via crafted web requests, potentially leading to session hijacking or data theft.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-0903?
CVE-2020-0903 is a medium-severity cross-site scripting vulnerability in Microsoft Exchange Server, published on 12 Mar 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A cross-site-scripting (XSS) vulnerability exists when Microsoft Exchange Server does not properly sanitize a specially crafted web request to an affected Exchange server, aka 'Microsoft Exchange Server Spoofing Vulnerability'.
Weakness: CWE-79
Which versions are affected by CVE-2020-0903?
It affects 1 product.
Products include Microsoft Exchange Server.
How do I fix CVE-2020-0903?
No fix has been published for CVE-2020-0903 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2020-0903 being exploited?
There is no known exploitation of CVE-2020-0903 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-5fpx-mqj4-mr33.