CVE-2026-42893

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network.

CVSS v3 7.4 HIGH

7.4^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42893	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:microsoft:outlook:*:*:*:*:*:iphone_os:*:*

History

26 Oct 2026, 18:10

Type	Values Removed	Values Added
Summary		(es) Neutralización incorrecta de elementos especiales utilizados en un comando (’inyección de comandos’) en M365 Copilot permite a un atacante no autorizado realizar manipulaciones a través de una red.

Information

Published : 2026-05-12 18:17

Updated : 2026-10-26 18:10

NVD link : CVE-2026-42893

Mitre link : CVE-2026-42893

CVE.ORG link : CVE-2026-42893

JSON object : View

Products Affected

microsoft

outlook

CWE

CWE-77

Improper Neutralization of Special Elements used in a Command ('Command Injection')

{"id": "CVE-2026-42893", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42893", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-13T10:11:22.473344Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 2.8}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Microsoft Outlook for iOS", "versions": [{"status": "affected", "version": "1.0.0", "lessThan": "5.2617.1", "versionType": "custom"}]}]}], "published": "2026-05-12T18:17:26.343", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42893", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-77"}]}], "descriptions": [{"lang": "en", "value": "Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network."}, {"lang": "es", "value": "Neutralizaci\u00f3n incorrecta de elementos especiales utilizados en un comando (\u2019inyecci\u00f3n de comandos\u2019) en M365 Copilot permite a un atacante no autorizado realizar manipulaciones a trav\u00e9s de una red."}], "lastModified": "2026-10-26T18:10:00.173", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:outlook:*:*:*:*:*:iphone_os:*:*", "vulnerable": true, "matchCriteriaId": "D8872A3D-4409-4562-9E09-7B2664731C83", "versionEndExcluding": "5.2617.1"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}