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Cross-site scripting in Microsoft Exchange Server

Published: 2020-03-10
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-0903
Exploitation vector Network
Public exploit N/A
Vulnerable software
Microsoft Exchange Server
Server applications / Mail servers

Vendor Microsoft

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Cross-site scripting

Severity: Medium

CVSSv3: 5.3 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-0903

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No


The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


Install update from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2016, 2016 Cumulative Update 1, 2016 Cumulative Update 2, 2016 Cumulative Update 3, 2016 Cumulative Update 4, 2016 Cumulative Update 5, 2016 Cumulative Update 6, 2016 Cumulative Update 7, 2016 Cumulative Update 8, 2016 Cumulative Update 9, 2016 Cumulative Update 10, 2016 Cumulative Update 11, 2016 Cumulative Update 12, 2016 Cumulative Update 13, 2016 Cumulative Update 14, 2016 Cumulative Update 15, 2019, 2019 Cumulative Update 1, 2019 Cumulative Update 2, 2019 Cumulative Update 3, 2019 Cumulative Update 4

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.