Affects Microsoft .NET, a widely deployed platform; signature bypass can enable widespread auth/exec compromise across enterprise apps.
CVE-2026-47304
.NET signature verification bypass allows forged data over network
Is CVE-2026-47304 being exploited?
Not confirmed. CVE-2026-47304 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-47304?
CVE-2026-47304 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-47304?
Yes. A fix has been recorded for CVE-2026-47304. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-47304 affect?
CVE-2026-47304 affects .NET Framework, .NET Core / .NET 5+, ASP.NET applications, Apps using System.Security.Cryptography. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-47304?
Apply vendor patch when released; restrict network exposure and perform additional signature validation.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Bypass signature checks to accept forged messages or assemblies, enabling authentication bypass, tampering, or remote code execution over the network.
Immediate action required
- affected>= 3.5.0 and < 2.0.50727.8983 & 3.0.30729.8978
- affected>= 4.7.0 and < 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
- affected>= 4.8.0 and < 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
- affected>= 4.8.1 and < 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
- affected>= 4.7.0 and < 4.7.4143.0
- affected>= 4.8.0 and < 4.8.4803.0
- affected>= 4.8.0.0 and < 4.8.9340.0
- affected>= 17.12.0 and < 17.12.22
- affected>= 17.14.0 and < 17.14.36
- affected>= 18.0 and < 18.7.4
- affected>= 10.0.0 and < 10.0.10
- affected>= 8.0.0 and < 8.0.29
- affected>= 9.0.0 and < 9.0.18
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.