MSRC_CVE-2026-69378
Vulnerability from csaf_microsoft - Published: 2026-09-08 07:00 - Updated: 2026-09-08 07:00Summary
Microsoft Exchange Server Denial of Service Vulnerability
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: 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.
CWE-674
- Uncontrolled Recursion
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.073
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
|
15.01.2507.073 | ||
|
Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1544.046
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
|
15.02.1544.046 | ||
|
Microsoft Exchange Server Subscription Edition RTM 15.02.2562.049
Microsoft / Microsoft Exchange Server Subscription Edition RTM
|
15.02.2562.049 | ||
|
Microsoft Exchange Server 2019 Cumulative Update 15 15.02.1748.051
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
|
15.02.1748.051 |
Known affected
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Microsoft Exchange Server 2016 Cumulative Update 23 <15.01.2507.073
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
|
<15.01.2507.073 |
Vendor Fix
fix
|
|
|
Microsoft Exchange Server 2019 Cumulative Update 14 <15.02.1544.046
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
|
<15.02.1544.046 |
Vendor Fix
fix
|
|
|
Microsoft Exchange Server Subscription Edition RTM <15.02.2562.049
Microsoft / Microsoft Exchange Server Subscription Edition RTM
|
<15.02.2562.049 |
Vendor Fix
fix
|
|
|
Microsoft Exchange Server 2019 Cumulative Update 15 <15.02.1748.051
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
|
<15.02.1748.051 |
Vendor Fix
fix
|
References
4 references
| URL | Category |
|---|---|
| https://msrc.microsoft.com/csaf/vex/2026/msrc_cve… | self |
| https://support.microsoft.com/lifecycle | external |
| https://www.first.org/cvss | external |
| https://msrc.microsoft.com/csaf/vex/2026/msrc_cve… | self |
{
"document": {
"category": "csaf_vex",
"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"
}
],
"publisher": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2026-69378 Microsoft Exchange Server Denial of Service Vulnerability - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-69378.json"
},
{
"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 Denial of Service Vulnerability",
"tracking": {
"current_release_date": "2026-09-08T07:00:00.000Z",
"generator": {
"date": "2026-10-01T22:52:24.945Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-69378",
"initial_release_date": "2026-09-08T07:00:00.000Z",
"revision_history": [
{
"date": "2026-09-08T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c15.01.2507.073",
"product": {
"name": "Microsoft Exchange Server 2016 Cumulative Update 23 \u003c15.01.2507.073",
"product_id": "4"
}
},
{
"category": "product_version",
"name": "15.01.2507.073",
"product": {
"name": "Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.073",
"product_id": "12039"
}
}
],
"category": "product_name",
"name": "Microsoft Exchange Server 2016 Cumulative Update 23"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c15.02.1544.046",
"product": {
"name": "Microsoft Exchange Server 2019 Cumulative Update 14 \u003c15.02.1544.046",
"product_id": "3"
}
},
{
"category": "product_version",
"name": "15.02.1544.046",
"product": {
"name": "Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1544.046",
"product_id": "12293"
}
}
],
"category": "product_name",
"name": "Microsoft Exchange Server 2019 Cumulative Update 14"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c15.02.2562.049",
"product": {
"name": "Microsoft Exchange Server Subscription Edition RTM \u003c15.02.2562.049",
"product_id": "1"
}
},
{
"category": "product_version",
"name": "15.02.2562.049",
"product": {
"name": "Microsoft Exchange Server Subscription Edition RTM 15.02.2562.049",
"product_id": "16792"
}
}
],
"category": "product_name",
"name": "Microsoft Exchange Server Subscription Edition RTM"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c15.02.1748.051",
"product": {
"name": "Microsoft Exchange Server 2019 Cumulative Update 15 \u003c15.02.1748.051",
"product_id": "2"
}
},
{
"category": "product_version",
"name": "15.02.1748.051",
"product": {
"name": "Microsoft Exchange Server 2019 Cumulative Update 15 15.02.1748.051",
"product_id": "12502"
}
}
],
"category": "product_name",
"name": "Microsoft Exchange Server 2019 Cumulative Update 15"
}
],
"category": "vendor",
"name": "Microsoft"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-69378",
"cwe": {
"id": "CWE-674",
"name": "Uncontrolled Recursion"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
}
],
"product_status": {
"fixed": [
"12039",
"12293",
"16792",
"12502"
],
"known_affected": [
"4",
"3",
"1",
"2"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-69378 Microsoft Exchange Server Denial of Service Vulnerability - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-69378.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-08T07:00:00.000Z",
"details": "15.01.2507.073:Security Update:https://support.microsoft.com/help/5121611",
"product_ids": [
"4"
],
"url": "https://support.microsoft.com/help/5121611"
},
{
"category": "vendor_fix",
"date": "2026-09-08T07:00:00.000Z",
"details": "15.02.1544.046:Security Update:https://support.microsoft.com/help/5121610",
"product_ids": [
"3"
],
"url": "https://support.microsoft.com/help/5121610"
},
{
"category": "vendor_fix",
"date": "2026-09-08T07:00:00.000Z",
"details": "15.02.2562.049:Security Update:https://support.microsoft.com/help/5121608",
"product_ids": [
"1"
],
"url": "https://support.microsoft.com/help/5121608"
},
{
"category": "vendor_fix",
"date": "2026-09-08T07:00:00.000Z",
"details": "15.02.1748.051:Security Update:https://support.microsoft.com/help/5121609",
"product_ids": [
"2"
],
"url": "https://support.microsoft.com/help/5121609"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 6.5,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C",
"version": "3.1"
},
"products": [
"1",
"2",
"3",
"4"
]
}
],
"title": "Microsoft Exchange Server Denial of Service Vulnerability"
}
]
}
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…
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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…