Xamarin.Forms Spoofing Vulnerability
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
<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>
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | xamarin.forms | 83.0.0 to before publication | publication | Patch available | CNA |
- xamarin.forms VendorMicrosoft Affected 83.0.0 to before publication Fixed in publication Patch available CNA
Remediation
- Fix · CNA xamarin.forms (Microsoft) Fixed in publication
Timeline
- 2026-10-02 Threatist record created from CVE-2020-16873
- 2026-10-03 Alias added: GHSA-mc93-wcph-m2mx
Sources
- CVE-2020-16873 · CVE Program
- CVE-2020-16873 · NVD
- FIRST EPSS
- GHSA-mc93-wcph-m2mx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences