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CVE-2026-62872: .NET Framework Elevation of Privilege Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-10-30
• Weakness: CWE-863

Description

Incorrect authorization in .NET Framework allows an authorized attacker to elevate privileges over a network.

Affected products

• Microsoft .NET Framework: 4.8.1, 4.8, 4.6.2, 4.7, 4.7.1, 4.7.2 (+1)
• Microsoft .NET Framework 3.5: from 3.5.0 before 2.0.50727.9183 & 3.0.30729.9169 — fixed in 2.0.50727.9183 & 3.0.30729.9169
• Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2: from 3.0.0.0 before 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0 — fixed in 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0
• Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0 before 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0 — fixed in 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0
• Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0 before 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0 — fixed in 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0
• Microsoft .NET Framework 3.5 AND 4.8.1: from 4.8.1 before 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0 — fixed in 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0
• Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2: from 4.7.0 before 4.7.4144.0 — fixed in 4.7.4144.0
• Microsoft .NET Framework 4.8: from 4.8.0 before 4.8.4805.0 — fixed in 4.8.4805.0
• Microsoft .NET Framework 4.8.1: from 4.8.0.0 before 4.8.9344.0 — fixed in 4.8.9344.0

How to fix

Upgrade to a fixed version: Microsoft .NET Framework 3.5 2.0.50727.9183 & 3.0.30729.9169; Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0; Microsoft .NET Framework 3.5 AND 4.7.2 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0; Microsoft .NET Framework 3.5 AND 4.8 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0; Microsoft .NET Framework 3.5 AND 4.8.1 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0; Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.4144.0; Microsoft .NET Framework 4.8 4.8.4805.0; Microsoft .NET Framework 4.8.1 4.8.9344.0. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62872

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