MSRC_CVE-2026-26133

Vulnerability from csaf_microsoft - Published: 2026-03-10 07:00 - Updated: 2026-04-09 07:00
Summary
M365 Copilot Information Disclosure 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-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Affected products
Product Identifier Version Remediation
Microsoft Outlook for Android 5.2605
Microsoft Outlook for Android
5.2605
Microsoft Outlook for iOS 5.2605
Microsoft Outlook for iOS
5.2605
Microsoft Word for Android 16.0.19822.20038
Microsoft Word for Android
16.0.19822.20038
Microsoft Edge for Android 145.3800.99
Microsoft Edge for Android
145.3800.99
Microsoft Teams for iOS 8.3.1
Microsoft Teams for iOS
8.3.1
Microsoft Edge for iOS 145.3800.99
Microsoft Edge for iOS
145.3800.99
Microsoft Teams for Android 1.0.0.2026043102
Microsoft Teams for Android
1.0.0.2026043102
Microsoft Excel for Android 16.0.19822.20038
Microsoft Excel for Android
16.0.19822.20038
Microsoft PowerPoint for Android 16.0.19822.20038
Microsoft PowerPoint for Android
16.0.19822.20038
Microsoft OneNote for Android 16.0.19725.20142
Microsoft OneNote for Android
16.0.19725.20142
Microsoft Outlook for Mac 5.2605
Microsoft Outlook for Mac
5.2605
Microsoft OneNote for iOS 2.106.26020617
Microsoft OneNote for iOS
2.106.26020617
Microsoft 365 Copilot for iOS 2.107.2
Microsoft 365 Copilot for iOS
2.107.2
Microsoft 365 Copilot for Android 16.0.19815.10000
Microsoft 365 Copilot for Android
16.0.19815.10000
Microsoft PowerBI for Android 2.2.260210.21290750
Microsoft PowerBI for Android
2.2.260210.21290750
Microsoft PowerBI for iOS 1.2.260302.2193910
Microsoft PowerBI for iOS
1.2.260302.2193910
Microsoft Excel for iOS 2.106.26020617
Microsoft Excel for iOS
2.106.26020617
Microsoft PowerPoint for iOS 2.106.26020617
Microsoft PowerPoint for iOS
2.106.26020617
Microsoft Word for iOS 2.106.26020617
Microsoft Word for iOS
2.106.26020617
Microsoft Loop for iOS 2.106.26020617
Microsoft Loop for iOS
2.106.26020617
Product Identifier Version Remediation
Microsoft Loop for iOS <2.106.26020617
Microsoft Loop for iOS
<2.106.26020617
Vendor Fix fix
Microsoft Word for iOS <2.106.26020617
Microsoft Word for iOS
<2.106.26020617
Vendor Fix fix
Microsoft PowerPoint for iOS <2.106.26020617
Microsoft PowerPoint for iOS
<2.106.26020617
Vendor Fix fix
Microsoft Excel for iOS <2.106.26020617
Microsoft Excel for iOS
<2.106.26020617
Vendor Fix fix
Microsoft PowerBI for iOS <1.2.260302.2193910
Microsoft PowerBI for iOS
<1.2.260302.2193910
Vendor Fix fix
Microsoft PowerBI for Android <2.2.260210.21290750
Microsoft PowerBI for Android
<2.2.260210.21290750
Vendor Fix fix
Microsoft 365 Copilot for Android <16.0.19815.10000
Microsoft 365 Copilot for Android
<16.0.19815.10000
Vendor Fix fix
Microsoft 365 Copilot for iOS <2.107.2
Microsoft 365 Copilot for iOS
<2.107.2
Vendor Fix fix
Microsoft OneNote for iOS <2.106.26020617
Microsoft OneNote for iOS
<2.106.26020617
Vendor Fix fix
Microsoft Outlook for Mac <5.2605
Microsoft Outlook for Mac
<5.2605
Vendor Fix fix
Microsoft OneNote for Android <16.0.19725.20142
Microsoft OneNote for Android
<16.0.19725.20142
Vendor Fix fix
Microsoft PowerPoint for Android <16.0.19822.20038
Microsoft PowerPoint for Android
<16.0.19822.20038
Vendor Fix fix
Microsoft Excel for Android <16.0.19822.20038
Microsoft Excel for Android
<16.0.19822.20038
Vendor Fix fix
Microsoft Teams for Android <1.0.0.2026043102
Microsoft Teams for Android
<1.0.0.2026043102
Vendor Fix fix
Microsoft Edge for iOS <145.3800.99
Microsoft Edge for iOS
<145.3800.99
Vendor Fix fix
Microsoft Teams for iOS <8.3.1
Microsoft Teams for iOS
<8.3.1
Vendor Fix fix
Microsoft Edge for Android <145.3800.99
Microsoft Edge for Android
<145.3800.99
Vendor Fix fix
Microsoft Word for Android <16.0.19822.20038
Microsoft Word for Android
<16.0.19822.20038
Vendor Fix fix
Microsoft Outlook for iOS <5.2605
Microsoft Outlook for iOS
<5.2605
Vendor Fix fix
Microsoft Outlook for Android <5.2605
Microsoft Outlook for Android
<5.2605
Vendor Fix fix
Threats
Impact Information Disclosure
Exploit Status Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
Acknowledgments
Andi Ahmeti <a href="(https://www.linkedin.com/in/andi-ahmeti/)"></a> with Permiso Security <a href="(https://permiso.io/)/"></a>

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-26133",
      "cwe": {
        "id": "CWE-77",
        "name": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "An attacker who successfully exploited this vulnerability could use malicious email to cause Copilot to present authoritative\u2011looking phishing messages that prompt the user to click links leading to data exfiltration or navigation to a malicious site.",
          "title": "According to the CVSS metric, the attack vector is network (AV:N) and user interaction is required (UI:R). Why does the CVE title indicate that this is information disclosure?"
        },
        {
          "category": "faq",
          "text": "An attacker who successfully exploited this vulnerability could potentially view sensitive information (confidentiality) or make limited changes to disclosed information (integrity); however, it is unlikely that both would be impacted simultaneously, and the attacker would not be able to affect availability.",
          "title": "According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), and some loss of integrity (I:L), but no loss of availability (A:N). What does that mean for this vulnerability?"
        }
      ],
      "product_status": {
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          "11685",
          "11772",
          "11815",
          "11858",
          "11966",
          "12007",
          "12031",
          "12032",
          "12153",
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          "12520",
          "21043",
          "21044",
          "21045",
          "21046",
          "21047",
          "21048",
          "21049",
          "21050"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6",
          "7",
          "8",
          "9",
          "10",
          "11",
          "12",
          "13",
          "14",
          "15",
          "16",
          "17",
          "18",
          "19",
          "20"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-26133 M365 Copilot Information Disclosure Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26133"
        },
        {
          "category": "self",
          "summary": "CVE-2026-26133 M365 Copilot Information Disclosure Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-26133.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "2.106.26020617:Security Update:https://apps.apple.com/us/app/microsoft-onenote/id410395246?platform=mac",
          "product_ids": [
            "9"
          ],
          "url": "https://apps.apple.com/us/app/microsoft-onenote/id410395246?platform=mac"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "5.2605:Security Update:https://go.microsoft.com/fwlink/p/?linkid=831049",
          "product_ids": [
            "10"
          ],
          "url": "https://go.microsoft.com/fwlink/p/?linkid=831049"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "5.2605:Security Update:https://learn.microsoft.com/en-us/officeupdates/release-notes-outlook-mobile",
          "product_ids": [
            "20"
          ],
          "url": "https://learn.microsoft.com/en-us/officeupdates/release-notes-outlook-mobile"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "2.107.2:Security Update:https://apps.apple.com/us/app/microsoft-365-copilot/id541164041",
          "product_ids": [
            "8"
          ],
          "url": "https://apps.apple.com/us/app/microsoft-365-copilot/id541164041"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "145.3800.99:Security Update:https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security",
          "product_ids": [
            "17",
            "15"
          ],
          "url": "https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "8.3.1:Security Update:https://apps.apple.com/us/app/microsoft-teams/id1113153706",
          "product_ids": [
            "16"
          ],
          "url": "https://apps.apple.com/us/app/microsoft-teams/id1113153706"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "1.0.0.2026043102:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.teams",
          "product_ids": [
            "14"
          ],
          "url": "https://play.google.com/store/apps/details?id=com.microsoft.teams"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "16.0.19822.20038:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.excel\u0026hl=en_US",
          "product_ids": [
            "13"
          ],
          "url": "https://play.google.com/store/apps/details?id=com.microsoft.office.excel\u0026hl=en_US"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "16.0.19822.20038:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.word\u0026hl=en_US",
          "product_ids": [
            "18"
          ],
          "url": "https://play.google.com/store/apps/details?id=com.microsoft.office.word\u0026hl=en_US"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "2.106.26020617:Security Update:https://apps.apple.com/us/app/microsoft-powerpoint/id586449534?platform=mac",
          "product_ids": [
            "3"
          ],
          "url": "https://apps.apple.com/us/app/microsoft-powerpoint/id586449534?platform=mac"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "2.106.26020617:Security Update:https://apps.apple.com/us/app/microsoft-word/id462054704?mt=12",
          "product_ids": [
            "2"
          ],
          "url": "https://apps.apple.com/us/app/microsoft-word/id462054704?mt=12"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "2.106.26020617:Security Update:https://apps.apple.com/us/app/microsoft-loop/id1637682491",
          "product_ids": [
            "1"
          ],
          "url": "https://apps.apple.com/us/app/microsoft-loop/id1637682491"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "5.2605:Security Update:https://apps.apple.com/ca/app/microsoft-outlook/id951937596",
          "product_ids": [
            "19"
          ],
          "url": "https://apps.apple.com/ca/app/microsoft-outlook/id951937596"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "16.0.19815.10000:Security Update:https://play.google.com/store/search?q=copilot+365\u0026c=apps",
          "product_ids": [
            "7"
          ],
          "url": "https://play.google.com/store/search?q=copilot+365\u0026c=apps"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "2.2.260210.21290750:Security Update:https://play.google.com/store/search?q=powerbi\u0026c=apps",
          "product_ids": [
            "6"
          ],
          "url": "https://play.google.com/store/search?q=powerbi\u0026c=apps"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "1.2.260302.2193910:Security Update:https://apps.apple.com/us/app/microsoft-power-bi/id929738808",
          "product_ids": [
            "5"
          ],
          "url": "https://apps.apple.com/us/app/microsoft-power-bi/id929738808"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "16.0.19725.20142:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.onenote",
          "product_ids": [
            "11"
          ],
          "url": "https://play.google.com/store/apps/details?id=com.microsoft.office.onenote"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "16.0.19822.20038:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.powerpoint\u0026hl=en_US",
          "product_ids": [
            "12"
          ],
          "url": "https://play.google.com/store/apps/details?id=com.microsoft.office.powerpoint\u0026hl=en_US"
        },
        {
          "category": "vendor_fix",
          "date": "2026-03-12T07:00:00.000Z",
          "details": "2.106.26020617:Security Update:https://apps.apple.com/us/app/microsoft-excel/id586683407?platform=mac",
          "product_ids": [
            "4"
          ],
          "url": "https://apps.apple.com/us/app/microsoft-excel/id586683407?platform=mac"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 6.2,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N/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"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Information Disclosure"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "M365 Copilot Information Disclosure Vulnerability"
    }
  ]
}


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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.

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.

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Detection rules are retrieved from Rulezet.

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