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High severity · published Oct 13, 2026
CVE-2026-83520
.NET Remote Code Execution Vulnerability
8.8
CVSS
1.4%
EPSS
No
On KEV
Description
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 73% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N1
.NET 10.0 runtime · Microsoft
10.0.0 before 10.0.13 · source: vendor
N1
.NET 11.0 runtime · Microsoft
11.0.0 before 11.0.0-rc.2 · source: vendor
N8
.NET 8.0 runtime · Microsoft
8.0.0 before 8.0.32 · source: vendor
N9
.NET 9.0 runtime · Microsoft
9.0.0 before 9.0.21 · source: vendor
MN
Microsoft .NET Framework 3.5 · Microsoft
3.5.0 before 2.0.50727.9188 AND 3.0.30729.9171 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 · Microsoft
3.0.0.0 before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.7.2 · Microsoft
4.7.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.8 · Microsoft
4.8.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.8.1 · Microsoft
4.8.1 before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 · source: vendor
MN
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 · Microsoft
4.7.0 before 4.7.4150.0 · source: vendor
MN
Microsoft .NET Framework 4.8 · Microsoft
4.8.0 before 4.8.4811.0 · source: vendor
MN
Microsoft .NET Framework 4.8.1 · Microsoft
4.8.0.0 before 4.8.9363.0 · source: vendor
Affected product
N1
.NET 10.0 runtime
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-83520
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-83520
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83520
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