DaystoPatch

MicrosoftExploited incident

Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

CVE-2026-56155High, CVSS 7.8In CISA's Known Exploited Vulnerabilities catalog since 14 Jul 2026

  • Exploited before a fix

Automated timeline. Not yet checked by a researcher, so it doesn't count toward any grade.

FixedFixed for every supported version on the day it became public.

Response

Silence
same day
First public report to first vendor statementUnverified source
Exposure
same day
First public report to first fix
Follow-through
same day
First public report to a fix for every supported version
  • Vendor silent
  • Vendor statement, no fix
  • Fixed for some versions
  • Fixed when disclosed
  • Date only, no time of day

Timeline and evidence

Open a moment to see its source and archived quote.

  1. First public report

    CVE.org record CVE-2026-56155ClaimedQuote verified

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

    CVE record published.

    Recorded time
    Precision
    To the minute
    Origin
    Claimed. The date the source gives.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:517d627ce9aed238…
    Used in metrics
    Yes
    Dispute this timestamp
    4 more sources for this moment
    Microsoft advisory CVE-2026-56155ClaimedQuote not found in archive14 Jul 2026

    Active Directory Federation Services Elevation of Privilege Vulnerability. Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to

    The vendor's own disclosure.

    Source
    Microsoft advisory CVE-2026-56155 vendor advisory
    Recorded time
    Precision
    Date only (no time of day is shown)
    Origin
    Claimed. The date the source gives.
    Quote check
    Not found in the archived copy. Treat with caution.
    Snapshot
    sha256:13b0a4b33ecd72c7…
    Used in metrics
    No, kept for the record
    Dispute this timestamp
    CISA KEV (CVE-2026-56155)ClaimedQuote verified14 Jul 2026

    Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

    Added to CISA's KEV catalog on 2026-07-14.

    Recorded time
    Precision
    Date only (no time of day is shown)
    Origin
    Claimed. The date the source gives.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:ef8fffede5c47200…
    Used in metrics
    No, kept for the record
    Dispute this timestamp
    Bluesky postClaimedQuote not checked yet14 Jul 2026, 18:12 UTC

    CVE-2026-56164 Microsoft SharePoint Server Elevation of Privilege Elevation of Privilege Moderate Exploited in the wild CVE-2026-56155 Active Directory Federation Services Elevation of Privilege Elevation of Privilege Important Exploited in the wild CVE-2026-50661 Windows BitLocker Security Feature

    Earliest third-party post we hold.

    Source
    Bluesky post social
    Recorded time
    Precision
    To the minute
    Origin
    Claimed. The date the source gives.
    Quote check
    Not checked yet
    Snapshot
    No archived snapshot
    Used in metrics
    No, kept for the record
    Dispute this timestamp
    Mastodon postClaimedQuote not checked yet14 Jul 2026, 18:21 UTC

    Microsoft's July Patch Tuesday: two 0-days already exploited in the wild - AD FS and SharePoint both hand attackers admin. 9 detections, 18 IOCs. Full analysis + IOCs: https://

    Earliest third-party post we hold.

    Source
    Mastodon post social
    Recorded time
    Precision
    To the minute
    Origin
    Claimed. The date the source gives.
    Quote check
    Not checked yet
    Snapshot
    No archived snapshot
    Used in metrics
    No, kept for the record
    Dispute this timestamp

  2. Vendor statement

    date onlysame dayUnverified: quote not found in the archived copy

    Microsoft advisory CVE-2026-56155ClaimedQuote not found in archive

    Active Directory Federation Services Elevation of Privilege Vulnerability. Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to

    Source
    Microsoft advisory CVE-2026-56155 vendor advisory
    Recorded time
    Precision
    Date only (no time of day is shown)
    Origin
    Claimed. The date the source gives.
    Quote check
    Not found in the archived copy. Treat with caution.
    Snapshot
    sha256:13b0a4b33ecd72c7…
    Used in metrics
    Yes
    Dispute this timestamp

  3. First workaround

    No official mitigation found yet.

  4. First fix

    date onlysame day

    Microsoft advisory CVE-2026-56155ClaimedQuote verified

    Information published.

    Vendor Fix listed at the first revision

    Source
    Microsoft advisory CVE-2026-56155 vendor advisory
    Recorded time
    Precision
    Date only (no time of day is shown)
    Origin
    Claimed. The date the source gives.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:e77540fbbdfa4c88…
    Used in metrics
    Yes
    Dispute this timestamp

  5. Fixed for all versions

    date onlysame day

    Microsoft advisory CVE-2026-56155ClaimedQuote verified

    Information published.

    every Known Affected product has a Vendor Fix and no later revision announces more updates

    Source
    Microsoft advisory CVE-2026-56155 vendor advisory
    Recorded time
    Precision
    Date only (no time of day is shown)
    Origin
    Claimed. The date the source gives.
    Quote check
    Found in the archived copy
    Snapshot
    sha256:e77540fbbdfa4c88…
    Used in metrics
    Yes
    Dispute this timestamp

Send this to your boss

No brief for this incident yet. We write one for every open incident and every critical bug exploited before a fix.

Affected products

  • Active Directory Federation Services
  • 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 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)

Related

Microsoft report card