What’s Vulnerable › Vulnerabilities

CVE-2020-16873: Xamarin.Forms Spoofing Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-09-11 · updated 2026-06-17
• Weakness: CWE-1188

Description

<p>A spoofing vulnerability manifests in Microsoft Xamarin.Forms due to the default settings on Android WebView version prior to 83.0.4103.106. This vulnerability could allow an attacker to execute arbitrary Javascript code on a target system.</p> <p>For the attack to be successful, the targeted user would need to browse to a malicious website or a website serving the malicious code through Xamarin.Forms.</p> <p>The security update addresses this vulnerability by preventing the malicious Javascript from running in the WebView.</p>

Affected products

• Microsoft xamarin.forms: all versions
• Microsoft xamarin.forms: from 83.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft xamarin.forms publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16873
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16873

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