CVE-2018-8558 Information disclosure in Microsoft Office

What is CVE-2018-8558?

CVE-2018-8558 is a medium-severity vulnerability in Microsoft Office, published on 14 Nov 2018. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An information disclosure vulnerability exists when Microsoft Outlook fails to respect "Default link type" settings configured via the SharePoint Online Admin Center, aka "Microsoft Outlook Information Disclosure Vulnerability." This affects Office 365 ProPlus, Microsoft Office. This CVE ID is unique from CVE-2018-8579.

Weakness: CWE-200

Which versions are affected by CVE-2018-8558?

It affects 2 products.

Products include Microsoft Office, Microsoft Office 365 Proplus.

How do I fix CVE-2018-8558?

No fix has been published for CVE-2018-8558 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-8558 being exploited?

There is no known exploitation of CVE-2018-8558 in the wild and no public exploit code.

Other vulnerabilities in Microsoft Office

• CVE-2018-0798 Microsoft Office Memory Corruption Exploited High 8.8
• CVE-2015-1770 Microsoft Office Uninitialized Memory Use Exploited High 8.8
• CVE-2006-2492 Microsoft Word Malformed Object Pointer Exploited High 8.8
• CVE-2018-0802 Microsoft Office Memory Corruption Exploited High 7.8
• CVE-2017-11882 Microsoft Office Memory Corruption Exploited High 7.8

All Microsoft Office vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-c7gg-mch8-hvm7.