Exploitation evidence
Not listed in the latest downloaded CISA KEV catalog. This does not establish an absence of exploitation.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Microsoft / Microsoft 365 Apps for Enterprise
Default status: Not specified
- affected: 16.0.1 to < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft / Microsoft Office 365 for Mac
Default status: Not specified
- affected: 1.0.0 to < 16.115.26110837 (custom)
Microsoft / Microsoft Office LTSC 2021
Default status: Not specified
- affected: 16.0.1 to < 16.0.14334.21048 (custom)
Microsoft / Microsoft Office LTSC 2024
Default status: Not specified
- affected: 16.0.0 to < 16.0.17932.21140 (custom)
Microsoft / Microsoft Office LTSC for Mac 2021
Default status: Not specified
- affected: 16.0.1 to < 16.115.26110837 (custom)
Microsoft / Microsoft Office LTSC for Mac 2024
Default status: Not specified
- affected: 16.0.0 to < 16.115.26110837 (custom)
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
Monitored source mentions
Shared CVE identifiers link source mentions; they do not establish that the reports describe the same incident.
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.00977,
"percentile": 0.62632
}12 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-120003",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-11-10T18:45:39.082292Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-11-10T18:47:22.190Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"product": "Microsoft 365 Apps for Enterprise",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "https://aka.ms/OfficeSecurityReleases",
"status": "affected",
"version": "16.0.1",
"versionType": "custom"
}
]
},
{
"product": "Microsoft Office 365 for Mac",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "16.115.26110837",
"status": "affected",
"version": "1.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"product": "Microsoft Office LTSC 2021",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "16.0.14334.21048",
"status": "affected",
"version": "16.0.1",
"versionType": "custom"
}
]
},
{
"platforms": [
"32-bit Systems",
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],
"product": "Microsoft Office LTSC 2024",
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{
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"status": "affected",
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}
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},
{
"product": "Microsoft Office LTSC for Mac 2021",
"vendor": "Microsoft",
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{
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}
]
},
{
"product": "Microsoft Office LTSC for Mac 2024",
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{
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}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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"versionEndExcluding": "16.115.26110837",
"versionStartIncluding": "16.0.1",
"vulnerable": true
},
{
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},
{
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{
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},
{
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"versionEndExcluding": "16.0.17932.21140",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*",
"versionEndExcluding": "https://aka.ms/OfficeSecurityReleases",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"datePublic": "2026-11-10T16:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code over a network."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-122",
"description": "CWE-122: Heap-based Buffer Overflow",
"lang": "en-US",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-11-11T17:20:50.642Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"name": "Microsoft Office Remote Code Execution Vulnerability",
"tags": [
"vendor-advisory",
"patch"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-120003"
}
],
"title": "Microsoft Office Remote Code Execution Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2026-120003",
"datePublished": "2026-11-10T18:25:11.542Z",
"dateReserved": "2026-10-30T17:58:13.878Z",
"dateUpdated": "2026-11-11T17:20:50.642Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}