CVE-2026-47303
HIGH 8.8Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Severe if exploited (CVSS 8.8), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.7%chance of exploitation in 30 days · 52nd percentile
Impact if exploited
8.8CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept & exploit code
- github-search Search GitHub for public PoC repos
Test against your own equipment
curl -s https://vulnpedia.com/cve/CVE-2026-47303/poc.jsonMachine-readable PoC index for this CVE (for automation).Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-47303/poc.json
Affected
Products .Net 10.0 .Net 8.0 .Net 9.0 Microsoft Visual Studio 2022 Version 17.12 Microsoft Visual Studio 2022 Version 17.14 Microsoft Visual Studio 2026 Version 18.7 .Net Macos Linux Kernel Windows Visual Studio 2022 Visual Studio 2026
Weakness (CWE)
- CWE-302: : Authentication Bypass by Assumed-Immutable Data
- CWE-863: : Incorrect Authorization
- CWE-90: : Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Microsoft | .Net | ≥ 8.0.0 and < 8.0.29 |
| Microsoft | .Net | ≥ 9.0.0 and < 9.0.18 |
| Microsoft | .Net | ≥ 10.0.0 and < 10.0.6 |
| Microsoft | Visual Studio 2022 | ≥ 17.12.0 and < 17.12.22 |
| Microsoft | Visual Studio 2022 | ≥ 17.14.0 and < 17.14.36 |
| Microsoft | Visual Studio 2026 | ≥ 18.7.0 and < 18.7.4 |
All CVSS metrics
- HIGH 8.8 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - HIGH 8.8 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H