CVE-2026-47303
HIGHCVSS 8.8/10EPSS 0.58%
Last modified
CVE-2026-47303 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.
Description
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | .Net | >= 8.0.0, < 8.0.29 |
| Microsoft | .Net | >= 9.0.0, < 9.0.18 |
| Microsoft | .Net | >= 10.0.0, < 10.0.6 |
| Microsoft | Visual Studio 2022 | >= 17.12.0, < 17.12.22 |
| Microsoft | Visual Studio 2022 | >= 17.14.0, < 17.14.36 |
| Microsoft | Visual Studio 2026 | >= 18.7.0, < 18.7.4 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-47303?
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
How severe is CVE-2026-47303?
CVE-2026-47303 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.
How do I fix CVE-2026-47303?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- Uncovering a hidden BOLA in Appsmith's snapshot logicStrix autonomously discovered a BOLA/IDOR vulnerability in Appsmith's snapshot deletion path.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-47298Improper authorization in Microsoft Office SharePoint allows…8
- CVE-2026-47299Improper neutralization of special elements used in a comman…7.2
- CVE-2026-4730The Charts Ninja: Create Beautiful Graphs & Charts and Easil…6.4
- CVE-2026-47300Incorrect implementation of authentication algorithm in ASP.…8.8
- CVE-2026-47301Improper access control in Microsoft Configuration Manager a…8.8
- CVE-2026-47302Allocation of resources without limits or throttling in .NET…7.5
- CVE-2026-47304Improper verification of cryptographic signature in .NET all…9.8
- CVE-2026-47305Protection mechanism failure in Visual Studio allows an unau…7.8
- CVE-2026-47306Uncontrolled Recursion vulnerability in Samsung Open Source …6.1
- CVE-2026-47307NULL pointer dereference vulnerability in Samsung Open Sourc…7.5
- CVE-2026-47308NULL pointer dereference vulnerability in Samsung Open Sourc…7.5
- CVE-2026-47309Uncontrolled Recursion vulnerability in Samsung Open Source …7.5
Are you affected by CVE-2026-47303?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST