CVE-2026-47304: Microsoft Security Advisory CVE-2026-47304 – .NET Security Feature Bypass Vulnerability

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET XML Encryption (System.Security.Cryptography.Xml). This advisory also provides guidance on what develo…

8.1CVSS Score

HIGHSeverity

NOCISA KEV

0.2%EPSS Score

VulnerabilityImpact Type

📋 Vulnerability Details

CVE ID	CVE-2026-47304
Vendor	nuget
Affected Product	System.Security.Cryptography.Xml
Vulnerability Type	Vulnerability
CVSS Score	8.1 (HIGH)
EPSS Score	0.2% probability of exploitation in the next 30 days
Actively Exploited	❌ No known exploitation
Patch Status	See Vendor Advisory →
Reported By	CYBERDUDEBIVASH SENTINEL APEX Intelligence (via github_advisories)

🔬 Technical Analysis

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET XML Encryption (System.Security.Cryptography.Xml). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A security feature bypass vulnerability exists in the XML encryption implementation (EncryptedXml) in .NET 8, .NET 9, and .NET 10. An attacker could exploit this vulnerability to bypass encryption protections and access encrypted data.

Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD

CVSS Details - Version: 3.1

• Severity: High

• Score: 8.1

• Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

• **Weak

🎯 Known Indicators of Compromise

{"type":"url","value":"https://github.com/dotnet/announcements/issues/**TBD**","confidence_score":0.82,"first_seen":"2026-07-20","source_count":1}

📚 Advisory References

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