MSRC_CVE-2026-21511
Vulnerability from csaf_microsoft - Published: 2026-02-10 08:00 - Updated: 2026-02-11 08:00Summary
Microsoft Outlook Spoofing 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-502
- Deserialization of Untrusted Data
Affected products
Fixed
15 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Microsoft Word 2016 (32-bit edition) 16.0.5539.1002
Microsoft Word 2016 (32-bit edition)
|
16.0.5539.1002 | ||
|
Microsoft Word 2016 (64-bit edition) 16.0.5539.1002
Microsoft Word 2016 (64-bit edition)
|
16.0.5539.1002 | ||
|
Microsoft SharePoint Enterprise Server 2016 16.0.5539.1002
Microsoft SharePoint Enterprise Server 2016
|
16.0.5539.1002 | ||
|
Microsoft Office 2019 for 32-bit editions https://aka.ms/OfficeSecurityReleases
Microsoft Office 2019 for 32-bit editions
|
https://aka.ms/OfficeSecurityReleases | ||
|
Microsoft Office 2019 for 64-bit editions https://aka.ms/OfficeSecurityReleases
Microsoft Office 2019 for 64-bit editions
|
https://aka.ms/OfficeSecurityReleases | ||
|
Microsoft SharePoint Server 2019 16.0.10417.20097
Microsoft SharePoint Server 2019
|
16.0.10417.20097 | ||
|
Microsoft 365 Apps for Enterprise for 32-bit Systems https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise for 32-bit Systems
|
https://aka.ms/OfficeSecurityReleases | ||
|
Microsoft 365 Apps for Enterprise for 64-bit Systems https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise for 64-bit Systems
|
https://aka.ms/OfficeSecurityReleases | ||
|
Microsoft Office LTSC for Mac 2021 16.106.26020821
Microsoft Office LTSC for Mac 2021
|
16.106.26020821 | ||
|
Microsoft Office LTSC 2021 for 64-bit editions https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2021 for 64-bit editions
|
https://aka.ms/OfficeSecurityReleases | ||
|
Microsoft Office LTSC 2021 for 32-bit editions https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2021 for 32-bit editions
|
https://aka.ms/OfficeSecurityReleases | ||
|
Microsoft SharePoint Server Subscription Edition 16.0.19127.20518
Microsoft SharePoint Server Subscription Edition
|
16.0.19127.20518 | ||
|
Microsoft Office LTSC 2024 for 32-bit editions https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 32-bit editions
|
https://aka.ms/OfficeSecurityReleases | ||
|
Microsoft Office LTSC 2024 for 64-bit editions https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 64-bit editions
|
https://aka.ms/OfficeSecurityReleases | ||
|
Microsoft Office LTSC for Mac 2024 16.106.26020821
Microsoft Office LTSC for Mac 2024
|
16.106.26020821 |
Known affected
15 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Microsoft Office LTSC for Mac 2024 <16.106.26020821
Microsoft Office LTSC for Mac 2024
|
<16.106.26020821 |
Vendor Fix
fix
|
|
|
Microsoft Office LTSC 2024 for 64-bit editions <https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 64-bit editions
|
<https://aka.ms/OfficeSecurityReleases |
Vendor Fix
fix
|
|
|
Microsoft Office LTSC 2024 for 32-bit editions <https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 32-bit editions
|
<https://aka.ms/OfficeSecurityReleases |
Vendor Fix
fix
|
|
|
Microsoft SharePoint Server Subscription Edition <16.0.19127.20518
Microsoft SharePoint Server Subscription Edition
|
<16.0.19127.20518 |
Vendor Fix
fix
|
|
|
Microsoft Office LTSC 2021 for 32-bit editions <https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2021 for 32-bit editions
|
<https://aka.ms/OfficeSecurityReleases |
Vendor Fix
fix
|
|
|
Microsoft Office LTSC 2021 for 64-bit editions <https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2021 for 64-bit editions
|
<https://aka.ms/OfficeSecurityReleases |
Vendor Fix
fix
|
|
|
Microsoft Office LTSC for Mac 2021 <16.106.26020821
Microsoft Office LTSC for Mac 2021
|
<16.106.26020821 |
Vendor Fix
fix
|
|
|
Microsoft 365 Apps for Enterprise for 64-bit Systems <https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise for 64-bit Systems
|
<https://aka.ms/OfficeSecurityReleases |
Vendor Fix
fix
|
|
|
Microsoft 365 Apps for Enterprise for 32-bit Systems <https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise for 32-bit Systems
|
<https://aka.ms/OfficeSecurityReleases |
Vendor Fix
fix
|
|
|
Microsoft SharePoint Server 2019 <16.0.10417.20097
Microsoft SharePoint Server 2019
|
<16.0.10417.20097 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Microsoft Office 2019 for 64-bit editions <https://aka.ms/OfficeSecurityReleases
Microsoft Office 2019 for 64-bit editions
|
<https://aka.ms/OfficeSecurityReleases |
Vendor Fix
fix
|
|
|
Microsoft Office 2019 for 32-bit editions <https://aka.ms/OfficeSecurityReleases
Microsoft Office 2019 for 32-bit editions
|
<https://aka.ms/OfficeSecurityReleases |
Vendor Fix
fix
|
|
|
Microsoft SharePoint Enterprise Server 2016 <16.0.5539.1002
Microsoft SharePoint Enterprise Server 2016
|
<16.0.5539.1002 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Microsoft Word 2016 (64-bit edition) <16.0.5539.1002
Microsoft Word 2016 (64-bit edition)
|
<16.0.5539.1002 |
Vendor Fix
fix
|
|
|
Microsoft Word 2016 (32-bit edition) <16.0.5539.1002
Microsoft Word 2016 (32-bit edition)
|
<16.0.5539.1002 |
Vendor Fix
fix
|
Threats
Impact
Spoofing
Exploit Status
Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely
References
7 references
Acknowledgments
Office Product Group Security Team
Anonymous
{
"document": {
"acknowledgments": [
{
"names": [
"Office Product Group Security Team"
]
},
{
"names": [
"Anonymous"
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}
],
"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": {
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"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2026-21511 Microsoft Outlook Spoofing Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21511"
},
{
"category": "self",
"summary": "CVE-2026-21511 Microsoft Outlook Spoofing Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-21511.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": "Microsoft Outlook Spoofing Vulnerability",
"tracking": {
"current_release_date": "2026-02-11T08:00:00.000Z",
"generator": {
"date": "2026-02-17T19:25:44.040Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-21511",
"initial_release_date": "2026-02-10T08:00:00.000Z",
"revision_history": [
{
"date": "2026-02-10T08:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
},
{
"date": "2026-02-11T08:00:00.000Z",
"legacy_version": "1.1",
"number": "2",
"summary": "Acknowledgement added. This is an informational change only."
}
],
"status": "final",
"version": "2"
}
},
"product_tree": {
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"product": {
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"product": {
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{
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{
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"product_id": "12"
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{
"category": "product_version",
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{
"category": "product_version",
"name": "https://aka.ms/OfficeSecurityReleases",
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"product_id": "8"
}
},
{
"category": "product_version",
"name": "https://aka.ms/OfficeSecurityReleases",
"product": {
"name": "Microsoft 365 Apps for Enterprise for 64-bit Systems https://aka.ms/OfficeSecurityReleases",
"product_id": "11763"
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}
],
"category": "product_name",
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{
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"product_id": "4"
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},
{
"category": "product_version",
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"product": {
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"product_id": "3"
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{
"category": "product_version",
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"product": {
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},
{
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},
"vulnerabilities": [
{
"cve": "CVE-2026-21511",
"cwe": {
"id": "CWE-502",
"name": "Deserialization of Untrusted Data"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
},
{
"category": "faq",
"text": "Yes, the Preview Pane is an attack vector.",
"title": "Is the Preview Pane an attack vector for this vulnerability?"
},
{
"category": "faq",
"text": "An attacker could exploit this spoofing vulnerability by using a specially crafted email to trigger an outbound NTLM authentication attempt to an attacker\u2011controlled server, resulting in credential disclosure.",
"title": "How could an attacker exploit this vulnerability?"
},
{
"category": "faq",
"text": "Yes. Customers should apply all updates offered for the software installed on their systems. If multiple updates apply, they can be installed in any order.",
"title": "There are multiple update packages available for some of the affected software. Do I need to install all the updates listed in the Security Updates table for the software?"
}
],
"product_status": {
"fixed": [
"10746",
"10747",
"10950",
"11573",
"11574",
"11585",
"11762",
"11763",
"11951",
"11952",
"11953",
"11961",
"12420",
"12421",
"12440"
],
"known_affected": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12",
"13",
"14",
"15"
]
},
"references": [
{
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"summary": "CVE-2026-21511 Microsoft Outlook Spoofing Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21511"
},
{
"category": "self",
"summary": "CVE-2026-21511 Microsoft Outlook Spoofing Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-21511.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2026-02-10T08:00:00.000Z",
"details": "16.0.5539.1002:Security Update:https://support.microsoft.com/help/5002841",
"product_ids": [
"13"
],
"url": "https://support.microsoft.com/help/5002841"
},
{
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"date": "2026-02-10T08:00:00.000Z",
"details": "16.0.5539.1002:Security Update:https://support.microsoft.com/help/5002840",
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"13"
],
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{
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{
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"product_ids": [
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},
{
"category": "vendor_fix",
"date": "2026-02-10T08:00:00.000Z",
"details": "https://aka.ms/OfficeSecurityReleases:Security Update:https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates",
"product_ids": [
"12",
"11",
"9",
"8",
"6",
"5",
"3",
"2"
],
"url": "https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates"
},
{
"category": "vendor_fix",
"date": "2026-02-10T08:00:00.000Z",
"details": "16.106.26020821:Security Update:https://go.microsoft.com/fwlink/p/?linkid=831049",
"product_ids": [
"7",
"1"
],
"url": "https://go.microsoft.com/fwlink/p/?linkid=831049"
},
{
"category": "vendor_fix",
"date": "2026-02-10T08:00:00.000Z",
"details": "16.0.19127.20518:Security Update:https://support.microsoft.com/help/5002833",
"product_ids": [
"4"
],
"url": "https://support.microsoft.com/help/5002833"
},
{
"category": "vendor_fix",
"date": "2026-02-10T08:00:00.000Z",
"details": "16.0.5539.1002:Security Update:https://support.microsoft.com/help/5002839",
"product_ids": [
"15",
"14"
],
"url": "https://support.microsoft.com/help/5002839"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 6.5,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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"
]
}
],
"threats": [
{
"category": "impact",
"details": "Spoofing"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely"
}
],
"title": "Microsoft Outlook Spoofing Vulnerability"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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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