CVE-2026-50324medium5.9

Windows Active Directory Federation Services Denial of Service Vulnerability

Impact

An infinite loop vulnerability in Windows Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network. The affected products include various versions of Microsoft .NET Framework and Windows operating systems. The vulnerability is caused by a loop with an unreachable exit condition.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Microsoft · microsoft

Microsoft .NET Framework 3.5 AND 4.7.2

1 range

microsoft version evidence

Platforms: Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation)

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.7.0 → before 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0

custom versions

Other versions: unknown

Microsoft · microsoft

Microsoft .NET Framework 3.5 AND 4.8

1 range

microsoft version evidence

Platforms: Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022 (Server Core installation)

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.8.0 → before 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0

custom versions

Other versions: unknown

Microsoft · microsoft

Microsoft .NET Framework 3.5 AND 4.8.1

1 range

microsoft version evidence

Platforms: Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows Server 2022, Windows Server 2022 (Server Core installation)

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.8.1 → before 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0

custom versions

Other versions: unknown

Microsoft · microsoft

Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2

1 range

microsoft version evidence

Platforms: Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.7.0 → before 4.7.4143.0

custom versions

Other versions: unknown

Microsoft · microsoft

Microsoft .NET Framework 4.8

1 range

microsoft version evidence

Platforms: Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation)

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.8.0 → before 4.8.4803.0

custom versions

Other versions: unknown

Microsoft · microsoft

Microsoft .NET Framework 4.8.1

1 range

microsoft version evidence

Platforms: Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.8.0.0 → before 4.8.9340.0

custom versions

Other versions: unknown

Microsoft · microsoft

Windows 10 Version 1607

1 range

microsoft version evidence

Platforms: 32-bit Systems, x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.14393.0 → before 10.0.14393.9339

custom versions

Other versions: unknown

Microsoft · microsoft

Windows 10 Version 1809

1 range

microsoft version evidence

Platforms: 32-bit Systems, x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.17763.0 → before 10.0.17763.9020

custom versions

Other versions: unknown

Microsoft · microsoft

Windows Server 2012 R2

1 range

microsoft version evidence

Platforms: x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

6.3.9600.0 → before 6.3.9600.23291

custom versions

Other versions: unknown

Microsoft · microsoft

Windows Server 2012 R2 (Server Core installation)

1 range

microsoft version evidence

Platforms: x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

6.3.9600.0 → before 6.3.9600.23291

custom versions

Other versions: unknown

Microsoft · microsoft

Windows Server 2016

1 range

microsoft version evidence

Platforms: x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.14393.0 → before 10.0.14393.9339

custom versions

Other versions: unknown

Microsoft · microsoft

Windows Server 2016 (Server Core installation)

1 range

microsoft version evidence

Platforms: x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.14393.0 → before 10.0.14393.9339

custom versions

Other versions: unknown

Microsoft · microsoft

Windows Server 2019

1 range

microsoft version evidence

Platforms: x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.17763.0 → before 10.0.17763.9020

custom versions

Other versions: unknown

Microsoft · microsoft

Windows Server 2019 (Server Core installation)

1 range

microsoft version evidence

Platforms: x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.17763.0 → before 10.0.17763.9020

custom versions

Other versions: unknown

Microsoft · microsoft

Windows Server 2022

1 range

microsoft version evidence

Platforms: x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.20348.0 → before 10.0.20348.5386

custom versions

Other versions: unknown

Microsoft · microsoft

Windows Server 2025

1 range

microsoft version evidence

Platforms: x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.26100.0 → before 10.0.26100.33158

custom versions

Other versions: unknown

Microsoft · microsoft

Windows Server 2025 (Server Core installation)

1 range

microsoft version evidence

Platforms: x64-based Systems

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.26100.0 → before 10.0.26100.33158

custom versions

Other versions: unknown

Original source description

Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

Inside the record

Evidence available

Package identity · not supplied

Version evidence

Remediation guidance · not supplied

Weakness classification

Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-50324

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-835 ↗

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

microsoft

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

microsoft · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*

From (inclusive): 10.0.17763.0

After:

Through (inclusive):

Before: 10.0.17763.9020

Vulnerable product

cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*

From (inclusive): 10.0.17763.0

After:

Through (inclusive):

Before: 10.0.17763.9020

Vulnerable product

cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*

From (inclusive): 10.0.17763.0

After:

Through (inclusive):

Before: 10.0.17763.9020

Vulnerable product

cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*

From (inclusive): 10.0.20348.0

After:

Through (inclusive):

Before: 10.0.20348.5386

Vulnerable product

cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

From (inclusive): 10.0.26100.0

After:

Through (inclusive):

Before: 10.0.26100.33158

Vulnerable product

cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

From (inclusive): 10.0.26100.0

After:

Through (inclusive):

Before: 10.0.26100.33158

Vulnerable product

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*

From (inclusive): 10.0.14393.0

After:

Through (inclusive):

Before: 10.0.14393.9339

Vulnerable product

cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*

From (inclusive): 10.0.14393.0

After:

Through (inclusive):

Before: 10.0.14393.9339

Vulnerable product

cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*

From (inclusive): 10.0.14393.0

After:

Through (inclusive):

Before: 10.0.14393.9339

Vulnerable product

cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*

From (inclusive): 6.3.9600.0

After:

Through (inclusive):

Before: 6.3.9600.23291

Vulnerable product

cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*

From (inclusive): 6.3.9600.0

After:

Through (inclusive):

Before: 6.3.9600.23291

Vulnerable product

cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*

From (inclusive): 4.8.0.0

After:

Through (inclusive):

Before: 4.8.9340.0

Vulnerable product

cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*

From (inclusive): 4.8.0

After:

Through (inclusive):

Before: 4.8.4803.0

Vulnerable product

cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*

From (inclusive): 4.8.0

After:

Through (inclusive):

Before: 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0

Vulnerable product

cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*

From (inclusive): 4.7.0

After:

Through (inclusive):

Before: 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0

Vulnerable product

cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*

From (inclusive): 4.7.0

After:

Through (inclusive):

Before: 4.7.4143.0

Vulnerable product

cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*

From (inclusive): 4.8.1

After:

Through (inclusive):

Before: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0

Original applicability statements

[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*",
            "versionStartIncluding": "10.0.17763.0",
            "versionEndExcluding": "10.0.17763.9020"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "10.0.17763.0",
            "versionEndExcluding": "10.0.17763.9020"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "10.0.17763.0",
            "versionEndExcluding": "10.0.17763.9020"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "10.0.20348.0",
            "versionEndExcluding": "10.0.20348.5386"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "10.0.26100.0",
            "versionEndExcluding": "10.0.26100.33158"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "10.0.26100.0",
            "versionEndExcluding": "10.0.26100.33158"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*",
            "versionStartIncluding": "10.0.14393.0",
            "versionEndExcluding": "10.0.14393.9339"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "10.0.14393.0",
            "versionEndExcluding": "10.0.14393.9339"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "10.0.14393.0",
            "versionEndExcluding": "10.0.14393.9339"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*",
            "versionStartIncluding": "6.3.9600.0",
            "versionEndExcluding": "6.3.9600.23291"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*",
            "versionStartIncluding": "6.3.9600.0",
            "versionEndExcluding": "6.3.9600.23291"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.8.0.0",
            "versionEndExcluding": "4.8.9340.0"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.8.0",
            "versionEndExcluding": "4.8.4803.0"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.8.0",
            "versionEndExcluding": "2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.7.0",
            "versionEndExcluding": "2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.7.0",
            "versionEndExcluding": "4.7.4143.0"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.8.1",
            "versionEndExcluding": "2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0"
          }
        ]
      }
    ]
  }
]

Contributing organizations · 2

microsoft

Assigning organization

2026-10-28

CISA-ADP

Additional data publisher

2026-07-14

What changed

Follow changes

No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

References

1 sources

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50324

vendor-advisorymicrosoft

Priority and evidence

Not in CISA KEVNo package fix recorded

KEV coverage does not rule out exploitation.

KEV checked 31/10/2026, 07:25:31 UTC

microsoft · CVSS:3.1 · 5.9

Assessment vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Reading the signals

Severity · CVSS: Technical impact and attack conditions. The headline is the highest imported catalog score; sources may disagree.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

CISA-ADP · SSVC

CISA Coordinator · 2026-07-14

Exploitation: none
Automatable: no
Technical Impact: partial

SSVC describes the publisher’s decision context. Your organization’s exposure and priorities may differ.

Record details

Published: 14/07/2026, 17:06:42 UTC
Modified: 28/10/2026, 20:03:23 UTC
Last imported by cve.new: 29/10/2026, 14:38:42 UTC
Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-50324

Enrichment coverage

NVDNot fully checked

GHSANot fully checked

EUVDNot fully checked

EPSSNot fully checked

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

Windows Active Directory Federation Services Denial of Service Vulnerability

Impact

Affected packages

Affected products

Microsoft .NET Framework 3.5 AND 4.7.2

affected

unaffected

unknown

Microsoft .NET Framework 3.5 AND 4.8

affected

unaffected

unknown

Microsoft .NET Framework 3.5 AND 4.8.1

affected

unaffected

unknown

Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2

affected

unaffected

unknown

Microsoft .NET Framework 4.8

affected

unaffected

unknown

Microsoft .NET Framework 4.8.1

affected

unaffected

unknown

Windows 10 Version 1607

affected

unaffected

unknown

Windows 10 Version 1809

affected

unaffected

unknown

Windows Server 2012 R2

affected

unaffected

unknown

Windows Server 2012 R2 (Server Core installation)

affected

unaffected

unknown

Windows Server 2016

affected

unaffected

unknown

Windows Server 2016 (Server Core installation)

affected

unaffected

unknown

Windows Server 2019

affected

unaffected

unknown

Windows Server 2019 (Server Core installation)

affected

unaffected

unknown

Windows Server 2022

affected

unaffected

unknown

Windows Server 2025

affected

unaffected

unknown

Windows Server 2025 (Server Core installation)

affected

unaffected

unknown

Original source description

Inside the record

Evidence available

Original records

Underlying weaknesses

Environment requirements

What changed

References