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CVE-2026-47304 is a security feature bypass vulnerability in .NET caused by improper verification of cryptographic signatures. An unauthorized attacker can exploit the flaw over a network. Affected components include System.Security.Cryptography.Xml and EncryptedXml in .NET 8, 9, and 10. The vulnerability is described as allowing bypass of XML encryption protections and access to encrypted data; it is also described as allowing bypass of authentication-related protections and user impersonation. The precise relationship between these two descriptions is not established.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
36 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical cryptographic signature verification vulnerability affecting .NET's System.Security.Cryptography.Xml library. It allows an unauthorized attacker to bypass a security feature over a network. The reference reports a CVSS v3 base score of 9.8 and recommends updating the library and related packages to version 8.0.0+echo.1 or later.
A .NET security-feature-bypass vulnerability. The plugin identifies this CVE as the source of its critical CVSS score.
A .NET security-feature-bypass vulnerability.
A .NET security-feature bypass vulnerability. The plugin identifies this CVE as the source of its critical CVSS score.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.