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Spoofing attack in Microsoft Office Online

Published: 2020-01-14
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-0647
Exploitation vector Network
Public exploit N/A
Vulnerable software
Office Online Server
Server applications / Other server solutions

Vendor Microsoft

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Spoofing attack

Severity: Medium

CVSSv3: 6.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-0647

CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)

Exploit availability: No


The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to the Office Online does not validate origin in cross-origin communications correctly. A remote attacker can send a specially crafted request to an affected site, perform cross-origin attacks on affected systems and gain access to sensitive information.


Install updates from vendor's website.

Vulnerable software versions

Office Online Server : 2016

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.

Is there known malware, which exploits this vulnerability?

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