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CVE-2026-56155CISA KEV

Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

Severity unknownCVSS unknownCheck the vendor advisory for fixed versions

CISA lists this Microsoft vulnerability as known exploited. Its MSRC release detail is outside this installation's collected history.

CISA KEVCheck MSRC

CISA catalog record

Microsoft Active Directory Federation Services contains an insufficient granularity of access control vulnerability that allows an authorized attacker to elevate privileges locally.

Product
Active Directory Federation Services
Added to KEV
14 Jul 2026
Federal remediation due
28 Jul 2026
Known ransomware use
Not reported
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (2)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  2. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete

Explore global source statements, affected packages and advisory history for CVE-2026-56155. The catalog has a separate collection scope from Microsoft release records.

More advisories, affected versions and source history

cve-program · CVE-2026-56155

Published

Windows 10 Version 1607

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows 10 Version 1607",
                    "platforms": [
                        "32-bit Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.14393.0",
                            "lessThan": "10.0.14393.9339",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows 10 Version 1809

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows 10 Version 1809",
                    "platforms": [
                        "32-bit Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.17763.0",
                            "lessThan": "10.0.17763.9020",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2012

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2012",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "6.2.9200.0",
                            "lessThan": "6.2.9200.26226",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2012 (Server Core installation)

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2012 (Server Core installation)",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "6.2.9200.0",
                            "lessThan": "6.2.9200.26226",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2012 R2

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2012 R2",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "6.3.9600.0",
                            "lessThan": "6.3.9600.23291",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2012 R2 (Server Core installation)

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2012 R2 (Server Core installation)",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "6.3.9600.0",
                            "lessThan": "6.3.9600.23291",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2016

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2016",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.14393.0",
                            "lessThan": "10.0.14393.9339",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2016 (Server Core installation)

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2016 (Server Core installation)",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.14393.0",
                            "lessThan": "10.0.14393.9339",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2019

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2019",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.17763.0",
                            "lessThan": "10.0.17763.9020",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2019 (Server Core installation)

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2019 (Server Core installation)",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.17763.0",
                            "lessThan": "10.0.17763.9020",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2022

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2022",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.20348.0",
                            "lessThan": "10.0.20348.5386",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2025

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2025",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.26100.0",
                            "lessThan": "10.0.26100.33158",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2025 (Server Core installation)

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2025 (Server Core installation)",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.26100.0",
                            "lessThan": "10.0.26100.33158",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 13 Nov 16:22 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current

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