Vulnerability identifier: #VU15871

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8558

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Office
Client/Desktop applications / Office applications

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to an error when Microsoft Outlook fails to respect "Default link type" settings configured via the SharePoint Online Admin Center. A remote attacker can share anonymously-accessible links to other users via email where these links are intended to be accessed only by specific users.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2019, 365 ProPlus

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8558

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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.