CVE-2026-97801: .NET Framework Tampering Vulnerability

Published Oct 13, 2026
·
Updated

.NET Framework Tampering Vulnerability

Other sources

Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network.

— Microsoft

Affected Software

19 affected componentsFixes available
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
Microsoft .NET Framework=4.8
4.8.4811.0
Microsoft .NET Framework=4.8
4.8.4811.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0
Microsoft .NET Framework=3.5, =4.6.2, =4.7, =4.7.1, =4.7.2
2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
Microsoft .NET Framework=4.8
4.8.4811.0
Microsoft .NET Framework=3.5, =4.6.2, =4.7, =4.7.1, =4.7.2
2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.10008.0
Microsoft .NET Framework=4.6.2, =4.7, =4.7.1, =4.7.2
4.7.4150.0
Microsoft .NET Framework=3.5
2.0.50727.9188 AND 3.0.30729.9171
Microsoft .NET Framework=3.5
2.0.50727.8987 AND 3.0.30729.8982
Microsoft .NET Framework=3.5
2.0.50727.8987 AND 3.0.30729.8982
Microsoft .NET Framework=4.6.2, =4.7, =4.7.1, =4.7.2
4.7.4150.0
Microsoft .NET Framework=4.8.1
4.8.9363.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
Microsoft .NET Framework=3.5, =4.7.2
2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4811.0Patch KB5127684
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0Patch KB5127685
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4811.0Patch KB5127686
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127693
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0Patch KB5127687
  6. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0Patch KB5126868
  7. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0Patch KB5127666
  8. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4811.0Patch KB5127688
  9. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.10008.0Patch KB5127694
  10. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.7.4150.0Patch KB5127668
  11. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171Patch KB5127696
  12. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8987 AND 3.0.30729.8982Patch KB5127664
  13. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8987 AND 3.0.30729.8982Patch KB5127660
  14. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.7.4150.0Patch KB5127667
  15. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.9363.0Patch KB5127691
  16. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127692
  17. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127690
  18. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0Patch KB5127683
  19. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127689

Event History

Oct 13, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·07:01 PM
Data Sourced
via MITRE·07:01 PM
DescriptionSeverity

Frequently Asked Questions

1

What does an attacker need to exploit this issue?

The vulnerability is exploitable over a network and does not require prior privileges or user interaction. The CVSS vector indicates low attack complexity.

2

What is the expected security impact if exploitation succeeds?

The reported impact is high on integrity, consistent with unauthorized tampering. No confidentiality or availability impact is indicated by the supplied CVSS vector.

Company

Resources

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