Is CVE-2026-56155 actively exploited?

Yes. KEV Intelligence tracks CVE-2026-56155 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2026-56155. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2026-56155 affects Microsoft Windows 10 Version 1607 and 12 other products. KEV Intelligence lists 13 version rows; examples include 10.0.14393.0 to < 10.0.14393.9339, 10.0.17763.0 to < 10.0.17763.9020, and 6.2.9200.0 to < 6.2.9200.26226.

Yes. CVE-2026-56155 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 11 hours ahead of CISA.

CVE-2026-56155 Exploited in the Wild — Windows 10 Version 1607, Windows 10 Version 1809, 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), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2025, Windows Server 2025 (Server Core installation)

Q: What is CVE-2026-56155?

CVE-2026-56155 is a vulnerability affecting Microsoft Windows 10 Version 1607 and 12 other products. Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2026-56155 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 11 hours ahead of CISA.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-56155 is a vulnerability affecting Microsoft Windows 10 Version 1607 and 12 other products. Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Microsoft / Windows 10 Version 1607 affected before 10.0.14393.9339.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Windows 10 Version 1607

Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.

Vendor Product Affected Status

Microsoft Windows 10 Version 1607 Before 10.0.14393.9339 Affected

Microsoft Windows 10 Version 1809 Before 10.0.17763.9020 Affected

Microsoft Windows Server 2012 Before 6.2.9200.26226 Affected

Microsoft Windows Server 2012 (Server Core installation) Before 6.2.9200.26226 Affected

Microsoft Windows Server 2012 R2 Before 6.3.9600.23291 Affected

Microsoft Windows Server 2012 R2 (Server Core installation) Before 6.3.9600.23291 Affected

Microsoft Windows Server 2016 Before 10.0.14393.9339 Affected

Microsoft Windows Server 2016 (Server Core installation) Before 10.0.14393.9339 Affected

Microsoft Windows Server 2019 Before 10.0.17763.9020 Affected

Microsoft Windows Server 2019 (Server Core installation) Before 10.0.17763.9020 Affected

Microsoft Windows Server 2022 Before 10.0.20348.5386 Affected

Microsoft Windows Server 2025 Before 10.0.26100.33158 Affected

Microsoft Windows Server 2025 (Server Core installation) Before 10.0.26100.33158 Affected

View vendor advisory

Published: 14 Jul 2026
Exploitation Reported: 14 Jul 2026
Attack vector: Local
Complexity: Low
Privileges: Low
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-56155
Active Directory Federation Services Elevation of Privilege Vulnerability msrc.microsoft.com · Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56155

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Microsoft CVRF

Recorded 14 Jul 2026

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
Microsoft CVRF First	2026-07-14 07:00 UTC
CISA	2026-07-14 17:38 UTC
CVE	2026-07-14 19:02 UTC
Tenable Blog	2026-07-14 19:20 UTC
All CISA Advisories	2026-07-14 21:20 UTC
Cisco Talos Blog	2026-07-14 22:20 UTC
Rapid7	2026-07-14 22:20 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.8 High

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

EPSS

2.3%

Weaknesses

Insufficient Granularity of Access Control CWE-1220

Recent mention · Tenable Blog

CVE-2026-32201, CVE-2026-45659, CVE-2026-56164: Frequently Asked Questions About Active Exploitation of Microsoft SharePoint Server Vulnerabilities

Four Microsoft SharePoint Server vulnerabilities are under active exploitation, prompting CISA to issue a hardening alert. An additional high-severity flaw recently patched adds pressure for organizations running on-premises deployments.Key TakeawaysCISA confirmed active...

Read full advisory

All Mentions

Recent mention · Tenable Blog

CVE-2026-32201, CVE-2026-45659, CVE-2026-56164: Frequently Asked Questions About Active Exploitation of Microsoft SharePoint Server Vulnerabilities

Tenable Blog · 16 Jul 2026

Four Microsoft SharePoint Server vulnerabilities are under active exploitation, prompting CISA to issue a hardening alert. An additional high-severity flaw recently patched adds pressure for organizations running on-premises deployments.Key TakeawaysCISA confirmed active exploitation of three on-premises SharePoint Server vulnerabilities (CVE-2026-32201, CVE-2026-45659, CVE-2026-56164), used to gain unauthorized access, establish remote code execution, steal IIS machine keys and deploy malware for persistence.Two additional SharePoint Server vulnerabilities disclosed on July 14, 2026,...

Recent mention · Rapid7

Patch Tuesday - July 2026

Rapid7 · 14 Jul 2026

Microsoft is publishing 622 vulnerabilities on July 2026 Patch Tuesday, including a record-breaking 416 Windows vulnerabilities. Microsoft is aware of exploitation in the wild for two of the vulnerabilities published today, both of which are listed on CISA KEV, as well as public disclosure for one other. As usual, browser vulns are not included in the Patch Tuesday count above. Rapid7 noted last month that Microsoft no longer enumerates Chromium CVEs in the Security Update Guide. However, Microsoft has now taken the pursuit of minimalism much further, since today’s Security Update Guide no...

Recent mention · Cisco Talos Blog

Microsoft Patch Tuesday for July 2026 — Snort rules and prominent vulnerabilities

Cisco Talos Blog · 14 Jul 2026

Microsoft has released its monthly security update for July 2026, which includes 622 vulnerabilities affecting a range of products, including 57 that Microsoft marked as "critical".Microsoft notes that two of the vulnerabilities disclosed this month have been exploited in the wild.CVE-2026-56155 is an important-

Recent mention · Tenable Blog

Microsoft’s July 2026 Patch Tuesday Addresses 569 CVEs (CVE-2026-56155, CVE-2026-56164)

Tenable Blog · 14 Jul 2026

56Critical510Important3Moderate0LowMicrosoft addresses 569 CVEs in the largest Patch Tuesday release yet. This month’s release includes three zero-days, two of which were exploited in the wild.Microsoft patched 569 CVEs in its July 2026 Patch Tuesday release, with 56 rated critical, 510 rated as important, and 3 rated as moderate. This marks the largest Patch Tuesday release ever, crushing the previous record of 198 CVEs in June. Last week, Microsoft announced that its multi-model agentic scanning harness (MDASH) is being used to identify vulnerabilities faster and noted that “customers...

Recent mention · All CISA Advisories

CISA Adds Four Known Exploited Vulnerabilities to Catalog

All CISA Advisories · 14 Jul 2026

CISA has added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-15409 SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability CVE-2026-15410 SonicWall SMA1000 Appliances Code Injection Vulnerability CVE-2026-56155 Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability CVE-2026-56164 Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber...

Timeline

From disclosure to observed exploitation

14 Jul 2026
KEV confirmed by Rapid7

Exploitation attested by an external source
14 Jul 2026
KEV confirmed by Cisco Talos Blog

Exploitation attested by an external source
14 Jul 2026
KEV confirmed by All CISA Advisories

Exploitation attested by an external source
14 Jul 2026
KEV confirmed by Tenable Blog

Exploitation attested by an external source
14 Jul 2026
KEV confirmed by CVE

Exploitation attested by an external source
14 Jul 2026
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
14 Jul 2026
CVE published

Vulnerability disclosed publicly
14 Jul 2026
Added to KEV Intelligence KEV Feed

High-confidence, third-party attested exploitation
19 Jun 2026
CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

View Pro pricing Read API docs

Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-56155

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2026-56155",
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.02333,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2026-56155

What security teams need to know first

Windows 10 Version 1607

Tags

CVE References

Why KEV Intelligence marks this CVE as exploited

Exploited in the wild

Known exploited vulnerability sources

Operational artifacts and observed signals

Observed signals

Scanner coverage

Virtual patch status

Severity, weaknesses, and research context

Weaknesses

CVE-2026-32201, CVE-2026-45659, CVE-2026-56164: Frequently Asked Questions About Active Exploitation of Microsoft SharePoint Server Vulnerabilities

All Mentions

From disclosure to observed exploitation

KEV confirmed by Rapid7

KEV confirmed by Cisco Talos Blog

KEV confirmed by All CISA Advisories

KEV confirmed by Tenable Blog

KEV confirmed by CVE

Added to CISA KEV

CVE published

Added to KEV Intelligence KEV Feed

CVE ID reserved

Automate this intelligence

Get alerts on high-impact exploitation