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CVE-2026-47303

Microsoft .net broken access control

8.8 HIGHEPSS 0.84%
  1. Published14 Jul 2026

Description

Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft .net≥ 10.0.0 < 10.0.6 · ≥ 8.0.0 < 8.0.29 · ≥ 9.0.0 < 9.0.18
Microsoft Visual Studio 2022≥ 17.12.0 < 17.12.22 · ≥ 17.14.0 < 17.14.36
Microsoft Visual Studio 2026≥ 18.7.0 < 18.7.4

Remediation

Fixed in
Microsoft .net≥ 10.0.6
Microsoft Visual Studio 2022≥ 17.12.22
Microsoft Visual Studio 2026≥ 18.7.4

References

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Frequently asked

Is CVE-2026-47303 being actively exploited?

CVE-2026-47303 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.84%.

How severe is CVE-2026-47303?

CVE-2026-47303 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.84% probability of exploitation.

Which products are affected by CVE-2026-47303?

Affected products include Microsoft .net, Microsoft Visual Studio 2022, Microsoft Visual Studio 2026.

How do I fix CVE-2026-47303?

Upgrade affected software to a fixed version, for example Microsoft .net 10.0.6, Microsoft Visual Studio 2022 17.12.22, Microsoft Visual Studio 2026 18.7.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-47303 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.