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CVE-2026-47303 is an elevation of privilege vulnerability in ASP.NET Core caused by authentication bypass involving assumed-immutable data. The flaw allows a low-privileged, authorized attacker to exploit the application over the network and bypass intended authorization boundaries, resulting in privilege escalation. Microsoft characterizes the issue as an authentication bypass condition in ASP.NET Core; however, specific vulnerable functions or code paths are not currently available.
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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.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An elevation of privilege vulnerability in ASP.NET Core.
An authentication bypass vulnerability in ASP.NET Core that allows an authorized attacker to elevate privileges over the network. The affected ecosystem includes Microsoft .NET and Visual Studio versions tied to ASP.NET Core.
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.