WID-SEC-W-2026-3457

Vulnerability from csaf_certbund - Published: 2026-09-17 22:00 - Updated: 2026-09-17 22:00
Summary
Microsoft Apps (Authenticator und 365 Copilot): Mehrere Schwachstellen
Severity
Hoch
Notes
Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.
Produktbeschreibung: Microsoft Authenticator ist eine App, die zur Zwei-Faktor-Authentifizierung und Kontoverwaltung verwendet wird. Microsoft Copilot ist ein KI-Assistent, der in verschiedene Microsoft-Produkte integriert werden kann.
Angriff: Ein Angreifer kann mehrere Schwachstellen in Microsoft Authenticator und Microsoft 365 Copilot ausnutzen, um seine Privilegien zu erhöhen, und um Informationen offenzulegen.
Betroffene Betriebssysteme: - Sonstiges - Windows
CVE-2026-78501
Affected products
Product Identifier Version Remediation
Microsoft 365 Copilot 365 Copilot's Business Chat
Microsoft / 365 Copilot
 cpe:/a:microsoft:365_copilot:365_copilots_business_chat 365 Copilot's Business Chat
Microsoft 365 Copilot
Microsoft / 365 Copilot
 cpe:/a:microsoft:365_copilot:- —
Microsoft Authenticator for Android
Microsoft / Authenticator
 cpe:/a:microsoft:authenticator:for_android for Android
CVE-2026-85885
Affected products
Known affected 3 products, the same list as for CVE-2026-78501
CVE-2026-85887
Affected products
Known affected 3 products, the same list as for CVE-2026-78501
References
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Microsoft Authenticator ist eine App, die zur Zwei-Faktor-Authentifizierung und Kontoverwaltung verwendet wird.\r\nMicrosoft Copilot ist ein KI-Assistent, der in verschiedene Microsoft-Produkte integriert werden kann.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in Microsoft Authenticator und Microsoft 365 Copilot ausnutzen, um seine Privilegien zu erh\u00f6hen, und um Informationen offenzulegen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Sonstiges\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-3457 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3457.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-3457 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-3457"
      },
      {
        "category": "external",
        "summary": "Microsoft Leitfaden f\u00fcr Sicherheitsupdates",
        "url": "https://msrc.microsoft.com/update-guide/"
      },
      {
        "category": "external",
        "summary": "Microsoft Security Advisory CVE-2026-80097",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80097"
      },
      {
        "category": "external",
        "summary": "Microsoft Security Advisory CVE-2026-58611",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58611"
      },
      {
        "category": "external",
        "summary": "Microsoft Security Advisory CVE-2026-85885",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85885"
      },
      {
        "category": "external",
        "summary": "Microsoft Security Advisory CVE-2026-85887",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85887"
      },
      {
        "category": "external",
        "summary": "Microsoft Security Advisory CVE-2026-78501",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78501"
      }
    ],
    "source_lang": "en-US",
    "title": "Microsoft Apps (Authenticator und 365 Copilot): Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-09-17T22:00:00.000+00:00",
      "generator": {
        "date": "2026-09-18T12:36:34.738+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-3457",
      "initial_release_date": "2026-09-17T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-09-17T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Microsoft 365 Copilot",
                "product": {
                  "name": "Microsoft 365 Copilot",
                  "product_id": "T059833",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:microsoft:365_copilot:-"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "365 Copilot\u0027s Business Chat",
                "product": {
                  "name": "Microsoft 365 Copilot 365 Copilot\u0027s Business Chat",
                  "product_id": "T059834",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:microsoft:365_copilot:365_copilots_business_chat"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "365 Copilot"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "for Android",
                "product": {
                  "name": "Microsoft Authenticator for Android",
                  "product_id": "T059832",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:microsoft:authenticator:for_android"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Authenticator"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-78501",
      "product_status": {
        "known_affected": [
          "T059834",
          "T059833",
          "T059832"
        ]
      },
      "release_date": "2026-09-17T22:00:00.000+00:00",
      "title": "CVE-2026-78501"
    },
    {
      "cve": "CVE-2026-85885",
      "product_status": {
        "known_affected": [
          "T059834",
          "T059833",
          "T059832"
        ]
      },
      "release_date": "2026-09-17T22:00:00.000+00:00",
      "title": "CVE-2026-85885"
    },
    {
      "cve": "CVE-2026-85887",
      "product_status": {
        "known_affected": [
          "T059834",
          "T059833",
          "T059832"
        ]
      },
      "release_date": "2026-09-17T22:00:00.000+00:00",
      "title": "CVE-2026-85887"
    }
  ]
}



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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.

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