Vulnerability · Published May 21, 2020 · Assigned by microsoft
CVE-2020-1100Microsoft Office SharePoint XSS Vulnerability
Medium 5.4
In plain English
A medium-severity cross-site scripting in Microsoft SharePoint Enterprise Server 2013 Service Pack 1 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 78% of all known vulnerabilities).
Official description
A cross-site-scripting (XSS) vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected SharePoint server. The attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current user. The attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim's identity to take actions on the SharePoint site on behalf of the user, such as change permissions and delete content, and inject malicious content in the browser of the user. The security update addresses the vulnerability by helping to ensure that SharePoint Server properly sanitizes web requests.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2013 Service Pack 1 | 15.0.0 – before publication |
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 – before publication |
| Microsoft | Microsoft SharePoint Server 2010 Service Pack 2 | 13.0.0.0 – before publication |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 – before publication |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- Microsoft Office SharePoint XSS Vulnerability vendor-advisory, patch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1100 x_refsource_MISC, x_transferred