{
"document": {
"acknowledgments": [
{
"names": [
"MARIOS GYFTOS"
]
},
{
"names": [
"DongJun Kim (smlijun) with UIUC"
]
},
{
"names": [
"Hwiwon Lee (hwiwonl) with UIUC"
]
},
{
"names": [
"Jongseong Kim (nevul37) with UIUC"
]
},
{
"names": [
"TALHA GÜNAY"
]
},
{
"names": [
"Younggi Park (grill66) with UIUC"
]
},
{
"names": [
"Artemy Tsetsersky with Angara Security"
]
}
],
"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": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2026-45501 Microsoft Exchange Server Spoofing Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45501"
},
{
"category": "self",
"summary": "CVE-2026-45501 Microsoft Exchange Server Spoofing Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-45501.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 Exchange Server Spoofing Vulnerability",
"tracking": {
"current_release_date": "2026-06-09T07:00:00.000Z",
"generator": {
"date": "2026-06-09T21:49:34.319Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-45501",
"initial_release_date": "2026-06-09T07:00:00.000Z",
"revision_history": [
{
"date": "2026-06-09T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "<15.02.2562.043",
"product": {
"name": "Microsoft Exchange Server Subscription Edition RTM <15.02.2562.043",
"product_id": "1"
}
},
{
"category": "product_version",
"name": "15.02.2562.043",
"product": {
"name": "Microsoft Exchange Server Subscription Edition RTM 15.02.2562.043",
"product_id": "16792"
}
}
],
"category": "product_name",
"name": "Microsoft Exchange Server Subscription Edition RTM"
},
{
"branches": [
{
"category": "product_version_range",
"name": "<15.01.2507.069",
"product": {
"name": "Microsoft Exchange Server 2016 Cumulative Update 23 <15.01.2507.069",
"product_id": "4"
}
},
{
"category": "product_version",
"name": "15.01.2507.069",
"product": {
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"product_id": "12039"
}
}
],
"category": "product_name",
"name": "Microsoft Exchange Server 2016 Cumulative Update 23"
},
{
"branches": [
{
"category": "product_version_range",
"name": "<15.02.1748.046",
"product": {
"name": "Microsoft Exchange Server 2019 Cumulative Update 15 <15.02.1748.046",
"product_id": "2"
}
},
{
"category": "product_version",
"name": "15.02.1748.046",
"product": {
"name": "Microsoft Exchange Server 2019 Cumulative Update 15 15.02.1748.046",
"product_id": "12502"
}
}
],
"category": "product_name",
"name": "Microsoft Exchange Server 2019 Cumulative Update 15"
},
{
"branches": [
{
"category": "product_version_range",
"name": "<15.02.1544.041",
"product": {
"name": "Microsoft Exchange Server 2019 Cumulative Update 14 <15.02.1544.041",
"product_id": "3"
}
},
{
"category": "product_version",
"name": "15.02.1544.041",
"product": {
"name": "Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1544.041",
"product_id": "12293"
}
}
],
"category": "product_name",
"name": "Microsoft Exchange Server 2019 Cumulative Update 14"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-45501",
"cwe": {
"id": "CWE-918",
"name": "Server-Side Request Forgery (SSRF)"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
}
],
"product_status": {
"fixed": [
"12039",
"12293",
"12502",
"16792"
],
"known_affected": [
"1",
"2",
"3",
"4"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-45501 Microsoft Exchange Server Spoofing Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45501"
},
{
"category": "self",
"summary": "CVE-2026-45501 Microsoft Exchange Server Spoofing Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-45501.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "15.02.2562.043:Security Update:https://support.microsoft.com/help/5094139",
"product_ids": [
"1"
],
"url": "https://support.microsoft.com/help/5094139"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "15.01.2507.069:Security Update:https://support.microsoft.com/help/5094144",
"product_ids": [
"4"
],
"url": "https://support.microsoft.com/help/5094144"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "15.02.1748.046:Security Update:https://support.microsoft.com/help/5094140",
"product_ids": [
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],
"url": "https://support.microsoft.com/help/5094140"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "15.02.1544.041:Security Update:https://support.microsoft.com/help/5094142",
"product_ids": [
"3"
],
"url": "https://support.microsoft.com/help/5094142"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 5.7,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C",
"version": "3.1"
},
"products": [
"1",
"2",
"3",
"4"
]
}
],
"threats": [
{
"category": "impact",
"details": "Spoofing"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
}
],
"title": "Microsoft Exchange Server Spoofing Vulnerability"
}
]
}