FKIE_CVE-2026-55054
Vulnerability from fkie_nvd - Published: 2026-07-14 18:18 - Updated: 2026-07-15 13:49
Severity
Summary
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
References
| URL | Tags | ||
|---|---|---|---|
| secure@microsoft.com | https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55054 | Vendor Advisory |
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| microsoft | 365_apps | - | |
| microsoft | 365_apps | - | |
| microsoft | excel | 2016 | |
| microsoft | excel | 2016 | |
| microsoft | office | 2019 | |
| microsoft | office | 2019 | |
| microsoft | office_2021 | * | |
| microsoft | office_2021 | - | |
| microsoft | office_2021 | - | |
| microsoft | office_2024 | * | |
| microsoft | office_2024 | - | |
| microsoft | office_2024 | - | |
| microsoft | office_online_server | * | |
| microsoft | office_365 | * | |
| apple | macos | - |
{
"affected": [
{
"affectedData": [
{
"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"
}
]
},
{
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"product": "Microsoft Excel 2016",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "16.0.5561.1001",
"status": "affected",
"version": "16.0.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"product": "Microsoft Office 2019",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "https://aka.ms/OfficeSecurityReleases",
"status": "affected",
"version": "19.0.0",
"versionType": "custom"
}
]
},
{
"product": "Microsoft Office 365 for Mac",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "16.111.26071215",
"status": "affected",
"version": "1.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"product": "Microsoft Office LTSC 2021",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "https://aka.ms/OfficeSecurityReleases",
"status": "affected",
"version": "16.0.1",
"versionType": "custom"
}
]
},
{
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"product": "Microsoft Office LTSC 2024",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "https://aka.ms/OfficeSecurityReleases",
"status": "affected",
"version": "16.0.0",
"versionType": "custom"
}
]
},
{
"product": "Microsoft Office LTSC for Mac 2021",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "16.111.26071215",
"status": "affected",
"version": "16.0.1",
"versionType": "custom"
}
]
},
{
"product": "Microsoft Office LTSC for Mac 2024",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "16.111.26071215",
"status": "affected",
"version": "16.0.0",
"versionType": "custom"
}
]
},
{
"product": "Office Online Server",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "16.0.10417.20175",
"status": "affected",
"version": "16.0.0.0",
"versionType": "custom"
}
]
}
],
"source": "secure@microsoft.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*",
"matchCriteriaId": "3259EBFE-AE2D-48B8-BE9A-E22BBDB31378",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*",
"matchCriteriaId": "CD25F492-9272-4836-832C-8439EBE64CCF",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*",
"matchCriteriaId": "CD88F667-6773-4DB7-B6C3-9C7B769C0808",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:*",
"matchCriteriaId": "B342EF98-B414-44D0-BAFB-FCA24294EECE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*",
"matchCriteriaId": "CF5DDD09-902E-4881-98D0-CB896333B4AA",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*",
"matchCriteriaId": "26A3B226-5D7C-4556-9350-5222DC8EFC2C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:office_2021:*:*:*:*:ltsc:macos:-:*",
"matchCriteriaId": "330C5657-6D52-4AD1-8F46-3DBD1F9E8C73",
"versionEndExcluding": "16.111.26071215",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*",
"matchCriteriaId": "1D518075-3362-4D15-93B1-0E6C61518D16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*",
"matchCriteriaId": "1059BEC6-C30B-4F0F-A878-5267A21CBD85",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:office_2024:*:*:*:*:ltsc:macos:-:*",
"matchCriteriaId": "B26CEB4F-E5AA-44DD-B7BA-C8926B10A7CC",
"versionEndExcluding": "16.111.26071215",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*",
"matchCriteriaId": "55A9AFDA-D77B-4CC7-ACE5-3A2ABDA257D8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*",
"matchCriteriaId": "8887D177-26A3-4008-89B6-50A9E9830F13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:office_online_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "746CEA14-C3AC-4256-A71D-BCA3A43459F8",
"versionEndExcluding": "16.0.10417.20175",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:office_365:*:*:*:*:-:*:*:*",
"matchCriteriaId": "32A28567-25F0-4EFE-93D5-5414F42EF135",
"versionEndExcluding": "16.111.26071215",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*",
"matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network."
}
],
"id": "CVE-2026-55054",
"lastModified": "2026-07-15T13:49:30.437",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "secure@microsoft.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-55054",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-14T18:09:32.805040Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-14T18:18:17.547",
"references": [
{
"source": "secure@microsoft.com",
"tags": [
"Vendor Advisory"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55054"
}
],
"sourceIdentifier": "secure@microsoft.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "secure@microsoft.com",
"type": "Secondary"
}
]
}
Loading…
Loading…
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.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
Loading…
Loading…