MSRC_CVE-2025-26678

Vulnerability from csaf_microsoft - Published: 2025-04-08 07:00 - Updated: 2025-04-08 07:00
Summary
Windows Defender Application Control Security Feature Bypass Vulnerability
Severity
Important
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.
CWE-284 - Improper Access Control
Affected products
Product Identifier Version Remediation
Windows 10 Version 1809 for 32-bit Systems 10.0.17763.7136
Windows 10 Version 1809 for 32-bit Systems
10.0.17763.7136
Windows 10 Version 1809 for x64-based Systems 10.0.17763.7136
Windows 10 Version 1809 for x64-based Systems
10.0.17763.7136
Windows Server 2019 10.0.17763.7136
Windows Server 2019
10.0.17763.7136
Windows Server 2019 (Server Core installation) 10.0.17763.7136
Windows Server 2019 (Server Core installation)
10.0.17763.7136
Windows Server 2022 10.0.20348.3453
Windows Server 2022
10.0.20348.3453
Windows Server 2022 (Server Core installation) 10.0.20348.3453
Windows Server 2022 (Server Core installation)
10.0.20348.3453
Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.5737
Windows 10 Version 21H2 for 32-bit Systems
10.0.19044.5737
Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.5737
Windows 10 Version 21H2 for ARM64-based Systems
10.0.19044.5737
Windows 10 Version 21H2 for x64-based Systems 10.0.19044.5737
Windows 10 Version 21H2 for x64-based Systems
10.0.19044.5737
Windows 11 Version 22H2 for ARM64-based Systems 10.0.22621.5189
Windows 11 Version 22H2 for ARM64-based Systems
10.0.22621.5189
Windows 11 Version 22H2 for x64-based Systems 10.0.22621.5189
Windows 11 Version 22H2 for x64-based Systems
10.0.22621.5189
Windows 10 Version 22H2 for x64-based Systems 10.0.19045.5737
Windows 10 Version 22H2 for x64-based Systems
10.0.19045.5737
Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.5737
Windows 10 Version 22H2 for ARM64-based Systems
10.0.19045.5737
Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.5737
Windows 10 Version 22H2 for 32-bit Systems
10.0.19045.5737
Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.5189
Windows 11 Version 23H2 for ARM64-based Systems
10.0.22631.5189
Windows 11 Version 23H2 for x64-based Systems 10.0.22631.5189
Windows 11 Version 23H2 for x64-based Systems
10.0.22631.5189
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1551
Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.1551
Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.3775
Windows 11 Version 24H2 for ARM64-based Systems
10.0.26100.3775
Windows 11 Version 24H2 for x64-based Systems 10.0.26100.3775
Windows 11 Version 24H2 for x64-based Systems
10.0.26100.3775
Windows Server 2025 10.0.26100.3775
Windows Server 2025
10.0.26100.3775
Windows Server 2025 (Server Core installation) 10.0.26100.3775
Windows Server 2025 (Server Core installation)
10.0.26100.3775
Product Identifier Version Remediation
Windows Server 2025 (Server Core installation) <10.0.26100.3775
Windows Server 2025 (Server Core installation)
<10.0.26100.3775
Vendor Fix fix
Windows Server 2025 <10.0.26100.3775
Windows Server 2025
<10.0.26100.3775
Vendor Fix fix
Windows 11 Version 24H2 for x64-based Systems <10.0.26100.3775
Windows 11 Version 24H2 for x64-based Systems
<10.0.26100.3775
Vendor Fix fix
Windows 11 Version 24H2 for ARM64-based Systems <10.0.26100.3775
Windows 11 Version 24H2 for ARM64-based Systems
<10.0.26100.3775
Vendor Fix fix
Windows Server 2022, 23H2 Edition (Server Core installation) <10.0.25398.1551
Windows Server 2022, 23H2 Edition (Server Core installation)
<10.0.25398.1551
Vendor Fix fix
Windows 11 Version 23H2 for x64-based Systems <10.0.22631.5189
Windows 11 Version 23H2 for x64-based Systems
<10.0.22631.5189
Vendor Fix fix
Windows 11 Version 23H2 for ARM64-based Systems <10.0.22631.5189
Windows 11 Version 23H2 for ARM64-based Systems
<10.0.22631.5189
Vendor Fix fix
Windows 10 Version 22H2 for 32-bit Systems <10.0.19045.5737
Windows 10 Version 22H2 for 32-bit Systems
<10.0.19045.5737
Vendor Fix fix
Windows 10 Version 22H2 for ARM64-based Systems <10.0.19045.5737
Windows 10 Version 22H2 for ARM64-based Systems
<10.0.19045.5737
Vendor Fix fix
Windows 10 Version 22H2 for x64-based Systems <10.0.19045.5737
Windows 10 Version 22H2 for x64-based Systems
<10.0.19045.5737
Vendor Fix fix
Windows 11 Version 22H2 for x64-based Systems <10.0.22621.5189
Windows 11 Version 22H2 for x64-based Systems
<10.0.22621.5189
Vendor Fix fix
Windows 11 Version 22H2 for ARM64-based Systems <10.0.22621.5189
Windows 11 Version 22H2 for ARM64-based Systems
<10.0.22621.5189
Vendor Fix fix
Windows 10 Version 21H2 for x64-based Systems <10.0.19044.5737
Windows 10 Version 21H2 for x64-based Systems
<10.0.19044.5737
Vendor Fix fix
Windows 10 Version 21H2 for ARM64-based Systems <10.0.19044.5737
Windows 10 Version 21H2 for ARM64-based Systems
<10.0.19044.5737
Vendor Fix fix
Windows 10 Version 21H2 for 32-bit Systems <10.0.19044.5737
Windows 10 Version 21H2 for 32-bit Systems
<10.0.19044.5737
Vendor Fix fix
Windows Server 2022 (Server Core installation) <10.0.20348.3453
Windows Server 2022 (Server Core installation)
<10.0.20348.3453
Vendor Fix fix
Windows Server 2022 <10.0.20348.3453
Windows Server 2022
<10.0.20348.3453
Vendor Fix fix
Windows Server 2019 (Server Core installation) <10.0.17763.7136
Windows Server 2019 (Server Core installation)
<10.0.17763.7136
Vendor Fix fix
Windows Server 2019 <10.0.17763.7136
Windows Server 2019
<10.0.17763.7136
Vendor Fix fix
Windows 10 Version 1809 for x64-based Systems <10.0.17763.7136
Windows 10 Version 1809 for x64-based Systems
<10.0.17763.7136
Vendor Fix fix
Windows 10 Version 1809 for 32-bit Systems <10.0.17763.7136
Windows 10 Version 1809 for 32-bit Systems
<10.0.17763.7136
Vendor Fix fix
Threats
Impact Security Feature Bypass
Exploit Status Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely

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            "name": "\u003c10.0.26100.3775",
            "product": {
              "name": "Windows Server 2025 \u003c10.0.26100.3775",
              "product_id": "2"
            }
          },
          {
            "category": "product_version",
            "name": "10.0.26100.3775",
            "product": {
              "name": "Windows Server 2025 10.0.26100.3775",
              "product_id": "12436"
            }
          }
        ],
        "category": "product_name",
        "name": "Windows Server 2025"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-26678",
      "cwe": {
        "id": "CWE-284",
        "name": "Improper Access Control"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "An attacker who successfully exploits this vulnerability could bypass Windows Defender Application Control (WDAC) enforcement. This could lead to the ability to run unauthorized applications on target systems.",
          "title": "What kind of security feature could be bypassed by successfully exploiting this vulnerability?"
        },
        {
          "category": "faq",
          "text": "An attacker could exploit this vulnerability by launching any executable that is allowed to launch by a per process rule. Once that executable is validly launched by the correct process, any restrictions on the executable are lifted; and it can be executed outside of the correct process. This bypasses the application control policy entirely",
          "title": "How could an attacker exploit this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "11568",
          "11569",
          "11571",
          "11572",
          "11923",
          "11924",
          "11929",
          "11930",
          "11931",
          "12085",
          "12086",
          "12097",
          "12098",
          "12099",
          "12242",
          "12243",
          "12244",
          "12389",
          "12390",
          "12436",
          "12437"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6",
          "7",
          "8",
          "9",
          "10",
          "11",
          "12",
          "13",
          "14",
          "15",
          "16",
          "17",
          "18",
          "19",
          "20",
          "21"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2025-26678 Windows Defender Application Control Security Feature Bypass Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26678"
        },
        {
          "category": "self",
          "summary": "CVE-2025-26678 Windows Defender Application Control Security Feature Bypass Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2025/msrc_cve-2025-26678.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-04-08T07:00:00.000Z",
          "details": "10.0.17763.7136:Security Update:https://support.microsoft.com/help/5055519",
          "product_ids": [
            "21",
            "20",
            "19",
            "18"
          ],
          "url": "https://support.microsoft.com/help/5055519"
        },
        {
          "category": "vendor_fix",
          "date": "2025-04-08T07:00:00.000Z",
          "details": "10.0.20348.3453:Security Update:https://support.microsoft.com/help/5055526",
          "product_ids": [
            "17",
            "16"
          ],
          "url": "https://support.microsoft.com/help/5055526"
        },
        {
          "category": "vendor_fix",
          "date": "2025-04-08T07:00:00.000Z",
          "details": "10.0.19044.5737:Security Update:https://support.microsoft.com/help/5055518",
          "product_ids": [
            "15",
            "14",
            "13"
          ],
          "url": "https://support.microsoft.com/help/5055518"
        },
        {
          "category": "vendor_fix",
          "date": "2025-04-08T07:00:00.000Z",
          "details": "10.0.22621.5189:Security Update:https://support.microsoft.com/help/5055528",
          "product_ids": [
            "12",
            "11"
          ],
          "url": "https://support.microsoft.com/help/5055528"
        },
        {
          "category": "vendor_fix",
          "date": "2025-04-08T07:00:00.000Z",
          "details": "10.0.19045.5737:Security Update:https://support.microsoft.com/help/5055518",
          "product_ids": [
            "10",
            "9",
            "8"
          ],
          "url": "https://support.microsoft.com/help/5055518"
        },
        {
          "category": "vendor_fix",
          "date": "2025-04-08T07:00:00.000Z",
          "details": "10.0.26100.3775:Security Update:https://support.microsoft.com/help/5055523",
          "product_ids": [
            "1",
            "4",
            "3",
            "2"
          ],
          "url": "https://support.microsoft.com/help/5055523"
        },
        {
          "category": "vendor_fix",
          "date": "2025-04-08T07:00:00.000Z",
          "details": "10.0.22631.5189:Security Update:https://support.microsoft.com/help/5055528",
          "product_ids": [
            "7",
            "6"
          ],
          "url": "https://support.microsoft.com/help/5055528"
        },
        {
          "category": "vendor_fix",
          "date": "2025-04-08T07:00:00.000Z",
          "details": "10.0.25398.1551:Security Update:https://support.microsoft.com/help/5055527",
          "product_ids": [
            "5"
          ],
          "url": "https://support.microsoft.com/help/5055527"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 7.3,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "10",
            "11",
            "12",
            "13",
            "14",
            "15",
            "16",
            "17",
            "18",
            "19",
            "20",
            "21"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Security Feature Bypass"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Windows Defender Application Control Security Feature Bypass Vulnerability"
    }
  ]
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Events included in the timeline

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.