MSRC_CVE-2026-26133
Vulnerability from csaf_microsoft - Published: 2026-03-10 07:00 - Updated: 2026-03-12 07:00Summary
M365 Copilot Information Disclosure Vulnerability
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.
{
"document": {
"acknowledgments": [
{
"names": [
"Andi Ahmeti (https://www.linkedin.com/in/andi-ahmeti/) with Permiso Security https://permiso.io/"
]
}
],
"aggregate_severity": {
"namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
"text": "Important"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Public",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en-US",
"notes": [
{
"category": "general",
"text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "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.",
"title": "Disclaimer"
},
{
"category": "general",
"text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
"title": "Customer Action"
}
],
"publisher": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"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"
},
{
"category": "external",
"summary": "Microsoft Exploitability Index",
"url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
},
{
"category": "external",
"summary": "Microsoft Support Lifecycle",
"url": "https://support.microsoft.com/lifecycle"
},
{
"category": "external",
"summary": "Common Vulnerability Scoring System",
"url": "https://www.first.org/cvss"
}
],
"title": "M365 Copilot Information Disclosure Vulnerability",
"tracking": {
"current_release_date": "2026-03-12T07:00:00.000Z",
"generator": {
"date": "2026-03-12T12:59:05.133Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-26133",
"initial_release_date": "2026-03-10T07:00:00.000Z",
"revision_history": [
{
"date": "2026-03-12T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c2.106.26020617",
"product": {
"name": "Microsoft OneNote for iOS \u003c2.106.26020617",
"product_id": "9"
}
},
{
"category": "product_version",
"name": "2.106.26020617",
"product": {
"name": "Microsoft OneNote for iOS 2.106.26020617",
"product_id": "12520"
}
}
],
"category": "product_name",
"name": "Microsoft OneNote for iOS"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c5.2605",
"product": {
"name": "Microsoft Outlook for Mac \u003c5.2605",
"product_id": "10"
}
},
{
"category": "product_version",
"name": "5.2605",
"product": {
"name": "Microsoft Outlook for Mac 5.2605",
"product_id": "12466"
}
}
],
"category": "product_name",
"name": "Microsoft Outlook for Mac"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c5.2605",
"product": {
"name": "Microsoft Outlook for Android \u003c5.2605",
"product_id": "20"
}
},
{
"category": "product_version",
"name": "5.2605",
"product": {
"name": "Microsoft Outlook for Android 5.2605",
"product_id": "10685"
}
}
],
"category": "product_name",
"name": "Microsoft Outlook for Android"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c2.107.2",
"product": {
"name": "Microsoft 365 Copilot for iOS \u003c2.107.2",
"product_id": "8"
}
},
{
"category": "product_version",
"name": "2.107.2",
"product": {
"name": "Microsoft 365 Copilot for iOS 2.107.2",
"product_id": "21043"
}
}
],
"category": "product_name",
"name": "Microsoft 365 Copilot for iOS"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c145.3800.99",
"product": {
"name": "Microsoft Edge for Android \u003c145.3800.99",
"product_id": "17"
}
},
{
"category": "product_version",
"name": "145.3800.99",
"product": {
"name": "Microsoft Edge for Android 145.3800.99",
"product_id": "11815"
}
}
],
"category": "product_name",
"name": "Microsoft Edge for Android"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c8.3.1",
"product": {
"name": "Microsoft Teams for iOS \u003c8.3.1",
"product_id": "16"
}
},
{
"category": "product_version",
"name": "8.3.1",
"product": {
"name": "Microsoft Teams for iOS 8.3.1",
"product_id": "11858"
}
}
],
"category": "product_name",
"name": "Microsoft Teams for iOS"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c1.0.0.2026043102",
"product": {
"name": "Microsoft Teams for Android \u003c1.0.0.2026043102",
"product_id": "14"
}
},
{
"category": "product_version",
"name": "1.0.0.2026043102",
"product": {
"name": "Microsoft Teams for Android 1.0.0.2026043102",
"product_id": "12007"
}
}
],
"category": "product_name",
"name": "Microsoft Teams for Android"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c16.0.19822.20038",
"product": {
"name": "Microsoft Excel for Android \u003c16.0.19822.20038",
"product_id": "13"
}
},
{
"category": "product_version",
"name": "16.0.19822.20038",
"product": {
"name": "Microsoft Excel for Android 16.0.19822.20038",
"product_id": "12031"
}
}
],
"category": "product_name",
"name": "Microsoft Excel for Android"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c16.0.19822.20038",
"product": {
"name": "Microsoft Word for Android \u003c16.0.19822.20038",
"product_id": "18"
}
},
{
"category": "product_version",
"name": "16.0.19822.20038",
"product": {
"name": "Microsoft Word for Android 16.0.19822.20038",
"product_id": "11772"
}
}
],
"category": "product_name",
"name": "Microsoft Word for Android"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c2.106.26020617",
"product": {
"name": "Microsoft PowerPoint for iOS \u003c2.106.26020617",
"product_id": "3"
}
},
{
"category": "product_version",
"name": "2.106.26020617",
"product": {
"name": "Microsoft PowerPoint for iOS 2.106.26020617",
"product_id": "21048"
}
}
],
"category": "product_name",
"name": "Microsoft PowerPoint for iOS"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c2.106.26020617",
"product": {
"name": "Microsoft Word for iOS \u003c2.106.26020617",
"product_id": "2"
}
},
{
"category": "product_version",
"name": "2.106.26020617",
"product": {
"name": "Microsoft Word for iOS 2.106.26020617",
"product_id": "21049"
}
}
],
"category": "product_name",
"name": "Microsoft Word for iOS"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c2.106.26020617",
"product": {
"name": "Microsoft Loop for iOS \u003c2.106.26020617",
"product_id": "1"
}
},
{
"category": "product_version",
"name": "2.106.26020617",
"product": {
"name": "Microsoft Loop for iOS 2.106.26020617",
"product_id": "21050"
}
}
],
"category": "product_name",
"name": "Microsoft Loop for iOS"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c5.2605",
"product": {
"name": "Microsoft Outlook for iOS \u003c5.2605",
"product_id": "19"
}
},
{
"category": "product_version",
"name": "5.2605",
"product": {
"name": "Microsoft Outlook for iOS 5.2605",
"product_id": "11685"
}
}
],
"category": "product_name",
"name": "Microsoft Outlook for iOS"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c16.0.19815.10000",
"product": {
"name": "Microsoft 365 Copilot for Android \u003c16.0.19815.10000",
"product_id": "7"
}
},
{
"category": "product_version",
"name": "16.0.19815.10000",
"product": {
"name": "Microsoft 365 Copilot for Android 16.0.19815.10000",
"product_id": "21044"
}
}
],
"category": "product_name",
"name": "Microsoft 365 Copilot for Android"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c2.2.260210.21290750",
"product": {
"name": "Microsoft PowerBI for Android \u003c2.2.260210.21290750",
"product_id": "6"
}
},
{
"category": "product_version",
"name": "2.2.260210.21290750",
"product": {
"name": "Microsoft PowerBI for Android 2.2.260210.21290750",
"product_id": "21045"
}
}
],
"category": "product_name",
"name": "Microsoft PowerBI for Android"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c1.2.260302.2193910",
"product": {
"name": "Microsoft PowerBI for iOS \u003c1.2.260302.2193910",
"product_id": "5"
}
},
{
"category": "product_version",
"name": "1.2.260302.2193910",
"product": {
"name": "Microsoft PowerBI for iOS 1.2.260302.2193910",
"product_id": "21046"
}
}
],
"category": "product_name",
"name": "Microsoft PowerBI for iOS"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c16.0.19725.20142",
"product": {
"name": "Microsoft OneNote for Android \u003c16.0.19725.20142",
"product_id": "11"
}
},
{
"category": "product_version",
"name": "16.0.19725.20142",
"product": {
"name": "Microsoft OneNote for Android 16.0.19725.20142",
"product_id": "12153"
}
}
],
"category": "product_name",
"name": "Microsoft OneNote for Android"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c145.3800.99",
"product": {
"name": "Microsoft Edge for iOS \u003c145.3800.99",
"product_id": "15"
}
},
{
"category": "product_version",
"name": "145.3800.99",
"product": {
"name": "Microsoft Edge for iOS 145.3800.99",
"product_id": "11966"
}
}
],
"category": "product_name",
"name": "Microsoft Edge for iOS"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c16.0.19822.20038",
"product": {
"name": "Microsoft PowerPoint for Android \u003c16.0.19822.20038",
"product_id": "12"
}
},
{
"category": "product_version",
"name": "16.0.19822.20038",
"product": {
"name": "Microsoft PowerPoint for Android 16.0.19822.20038",
"product_id": "12032"
}
}
],
"category": "product_name",
"name": "Microsoft PowerPoint for Android"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c2.106.26020617",
"product": {
"name": "Microsoft Excel for iOS \u003c2.106.26020617",
"product_id": "4"
}
},
{
"category": "product_version",
"name": "2.106.26020617",
"product": {
"name": "Microsoft Excel for iOS 2.106.26020617",
"product_id": "21047"
}
}
],
"category": "product_name",
"name": "Microsoft Excel for iOS"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-26133",
"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": {
"fixed": [
"10685",
"11685",
"11772",
"11815",
"11858",
"11966",
"12007",
"12031",
"12032",
"12153",
"12466",
"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"
}
]
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
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.
Loading…
Loading…