CVE-2026-50659
MEDIUMCVSS 6.5/10EPSS 0.41%
Last modified
CVE-2026-50659 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.. EPSS estimates a 0.41% chance of exploitation in the next 30 days.
Description
Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | .Net Framework | 4.8.1 |
| Microsoft | .Net Framework | 4.8 |
| Microsoft | .Net Framework | 4.6.2 |
| Microsoft | .Net Framework | 4.7 |
| Microsoft | .Net Framework | 4.7.1 |
| Microsoft | .Net Framework | 4.7.2 |
| 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 | .Net Framework | 3.5 |
| 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-2026-50659Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-50659?
Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.
How severe is CVE-2026-50659?
CVE-2026-50659 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.
How do I fix CVE-2026-50659?
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
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- 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.
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Are you affected by CVE-2026-50659?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST