Exploited CVEs / Microsoft / CVE-2026-56155

CVE-2026-56155

Patch now
Exploited in the wild: confirmed by the CISA KEV catalog, not predicted.
The fix ships from the vendor: Microsoft Security Update Guide (MSRC).
Do this now: Federal remediation deadline 2026-07-28; treat it as your outer bound. Patch now and verify deployment on every exposed device.

Actively exploited Microsoft Active Directory Federation Services vulnerability. Added to the CISA KEV catalog 2026-07-14.

Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2026-07-28; treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Microsoft Security Update Guide (MSRC), linked below.

UnratedCISA KEV

Risk summary

CVSS base
-
EPSS exploit probability
Not scored
Severity
Unrated
Added to KEV
2026-07-14
CISA due date
2026-07-28

Senserva AI Opinion and rich prompt for CVE-2026-56155

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for CVE-2026-56155

Published
2026-07-14
Last revised
2026-07-14
Changes tracked
1

Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.

CISA required action

Federal (BOD 22-01) remediation due date: 2026-07-28.

Official fix for CVE-2026-56155

The authoritative fix and affected-version list are published by the vendor. Find the Active Directory Federation Services advisory on Microsoft Security Update Guide (MSRC).

Microsoft Security Update Guide (MSRC)CISA KEV entry

Common questions about CVE-2026-56155

Is CVE-2026-56155 actively exploited?

Yes. CVE-2026-56155 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-07-14, which means exploitation in the wild has been confirmed, not predicted.

What is the CISA deadline and required action for CVE-2026-56155?

CISA set the federal (BOD 22-01) remediation due date at 2026-07-28.

What fixes CVE-2026-56155?

The authoritative fix is in the vendor advisory: see Microsoft Security Update Guide (MSRC) for the patched Active Directory Federation Services versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.

Can I ask my own AI about CVE-2026-56155?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-56155's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).

More exploited Microsoft CVEs

The newest Microsoft entries on the CISA KEV catalog:

CVE-2026-56164CVE-2008-4250CVE-2009-1537CVE-2010-0249CVE-2010-0806CVE-2026-41091CVE-2026-45498CVE-2026-33825

All Microsoft exploited CVEs on one page: Microsoft vulnerabilities actively exploited.

Authoritative references

CVE recordNVD detailCISA KEV catalogMicrosoft MSRCFIRST.org EPSS

Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.

Get this as data: free feeds and API

Every patch and CVE on this site is available as free, machine-readable data via the Senserva Hot Patches feeds and JSON API: a unique, daily-ranked list of the Microsoft patches and CVEs of most interest, plus RSS and a Patch Tuesday calendar. No login or key. Pull it into your SIEM, RMM, scripts, or spreadsheets.

Senserva free feeds & APIHot Patches (hot.json)

Free to use with attribution: display "Patch Data Provided by Senserva" with a link to the feeds page.

Most searched on Senserva right now

KB5094123: patch details CVE-2008-4250: severity and the patch CVE-2026-48282: severity and the patch CVE-2007-3010: how to fix it CVE-2026-55255: severity and the patch KB5094122: patch details CVE-2012-0151: severity and the patch KB5093998: the full CVE list CVE-2014-1761: severity and the patch CVE-2019-0808 patch and risk

Sponsored by Senserva

This page shows the fix. Siemserva by Senserva shows which of your devices are still missing it: which ones are exposed to CVE-2026-56155, for example, ranked by what attackers actually exploit.

  • Patch status in one scan: which devices are affected, which are not
  • Missing updates ranked by CISA KEV and EPSS, so you fix the right things first
  • Data from Intune, Microsoft Defender, Windows Autopatch, and Azure Update Manager, with more sources on the way
  • Third-party app patching too: updates published to Intune by PatchMyPC, Scappman, Robopack, or any vendor, read vendor-neutrally
  • Optional AI Enhanced Reporting: plain-language summaries and recommended next steps written into your reports
  • Then go further: 650+ security checks find the most common Microsoft 365 security misconfigurations, with compliance evidence and Senserva Trustworthy AI remediation
Senserva patching for Microsoft 365
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Patching in action in two minutes. Watch page · All videos.

SenservaPATCHINGTenant: Contoso Manufacturing ▾OverviewAutopatch healthDevicesAsk SenservaExport Patch Status Report
3 actively exploited CVEs are unmitigated on devices in this tenant, per CISA KEV.View fix-first list ↓
312
Devices scanned
Intune + Autopatch + Defender
3
Exploited updates missing
CISA KEV, unmitigated
905
Microsoft updates tracked
Refreshed daily, MSRC + NVD
650+
Security checks in scan
Patch, config, identity, logs

Triage order for this list

Same order in the dashboard, the report, and every AI answer
1st · overrides everything
Actively exploited (KEV)
e.g. KB5040219, CVE-2026-31210
→
2nd · tiebreaker
Severity (Critical → Low)
MSRC + EPSS probability
→
3rd · tiebreaker
Days waiting
Oldest unresolved first

Ranked missing updates, fix-first order

27 findings · showing top 2
#UpdateCVESeveritySourceDevicesWaiting
1KB5040219
Windows 11 23H2 cumulative
CVE-2026-31210
KEV EPSS 0.94		CriticalDefender4119 daysAdd to fix-first
2KB5040088
.NET Framework security update
CVE-2026-29981
KEV		CriticalIntune1712 daysAdd to fix-first
Estimated dashboard, sample data for illustration

Ask Senserva

via Claude + MCP
Which devices are still missing the fix for CVE-2026-31210?
41 devices are missing KB5040219, which resolves CVE-2026-31210. This CVE is on CISA KEV, so CISA BOD 22-01 calls for remediation within 14 days. You are at 19 days and counting.
source: scan_db · defender_posture · kev_join, not model memory
Get Devices Found Get Devices Missing
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Lexicon: the terms on this page
CVE
Common Vulnerabilities and Exposures. A unique ID for one publicly known vulnerability, such as CVE-2025-1234.
KB
Microsoft Knowledge Base article. The identifier for a specific Microsoft update.
KEV
CISA Known Exploited Vulnerabilities. CVEs confirmed exploited in the wild. Fix these first.
CVSS
Common Vulnerability Scoring System. A standardized Severity score from 0 to 10.
EPSS
Exploit Prediction Scoring System. The probability a CVE will be exploited in the next 30 days.
MSRC
Microsoft Security Response Center. Microsoft's Patch Tuesday advisories and KB-to-CVE mapping.
NVD
National Vulnerability Database (NIST). Authoritative CVE metadata and CVSS scores.
Ransomware
The vulnerability is linked to known ransomware activity.

Please link to this page to stay current.

Reference: Microsoft CVE and vulnerability management, the full CVE-to-patch lookup ranked by real-world risk, and the Microsoft patching guide, how Intune, Windows Autopatch, Defender, and Azure Update Manager fit together.
Data notice: this page, the feeds, and the API are provided as is, for informational purposes only, without warranty of any kind. Senserva, LLC does not guarantee the accuracy, completeness, or timeliness of third-party data (MSRC, NVD, CISA KEV, EPSS) and accepts no liability for actions taken based on it; verify against the authoritative vendor advisory before acting. Built daily with Senserva Trustworthy AI. All use of this data is subject to the Senserva EULA.