FKIE_CVE-2026-21527
Vulnerability from fkie_nvd - Published: 2026-02-10 18:16 - Updated: 2026-06-17 10:18
Severity
Summary
User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
References
| URL | Tags | ||
|---|---|---|---|
| secure@microsoft.com | https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21527 | Vendor Advisory |
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| microsoft | exchange_server | 2016 | |
| microsoft | exchange_server | 2019 | |
| microsoft | exchange_server | 2019 | |
| microsoft | exchange_server_subscription_edition | * |
{
"affected": [
{
"affectedData": [
{
"platforms": [
"x64-based Systems"
],
"product": "Microsoft Exchange Server 2016 Cumulative Update 23",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "15.01.2507.066",
"status": "affected",
"version": "15.01.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Microsoft Exchange Server 2019 Cumulative Update 14",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "15.02.1544.039",
"status": "affected",
"version": "15.02.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Microsoft Exchange Server 2019 Cumulative Update 15",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "15.02.1748.043",
"status": "affected",
"version": "15.02.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"x64-based Systems"
],
"product": "Microsoft Exchange Server Subscription Edition RTM",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "15.02.2562.037",
"status": "affected",
"version": "15.02.0.0",
"versionType": "custom"
}
]
}
],
"source": "secure@microsoft.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*",
"matchCriteriaId": "FF76AEDA-E574-40ED-B64F-8FDEF8CAC802",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:*",
"matchCriteriaId": "8C98993B-82A5-48CC-947F-896CEA0CDB7F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_15:*:*:*:*:*:*",
"matchCriteriaId": "7166BCE0-1D55-46B2-96B9-250AB4BB6291",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:*",
"matchCriteriaId": "1B4531B1-0FA4-41D5-9890-A2D8943213C3",
"versionEndExcluding": "15.02.2562.037",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network."
},
{
"lang": "es",
"value": "La tergiversaci\u00f3n de informaci\u00f3n cr\u00edtica en la interfaz de usuario (IU) de Microsoft Exchange Server permite a un atacante no autorizado realizar suplantaci\u00f3n a trav\u00e9s de una red."
}
],
"id": "CVE-2026-21527",
"lastModified": "2026-06-17T10:18:47.190",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 2.5,
"source": "secure@microsoft.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-21527",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-11T15:32:37.141565Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-02-10T18:16:35.093",
"references": [
{
"source": "secure@microsoft.com",
"tags": [
"Vendor Advisory"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21527"
}
],
"sourceIdentifier": "secure@microsoft.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-345"
},
{
"lang": "en",
"value": "CWE-451"
},
{
"lang": "en",
"value": "CWE-1286"
}
],
"source": "secure@microsoft.com",
"type": "Secondary"
}
]
}
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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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