Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Update Service allows an autho…
cve CVE-2026-26174 1 source, 1 claim · Watch
NVD writes:
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Update Service allows an authorized attacker to elevate privileges locally. the claim
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Update Service allows an authorized attacker to elevate privileges locally. the claim
- Severity
- HIGH NVD
- CVSS
- 7 NVD
- Fixed in
- 10.0.14393.9060, 10.0.17763.8644, 10.0.19044.7184, 10.0.19045.7184, 10.0.22631.6936, 10.0.26100.8246, 10.0.26200.8246, 10.0.28000.1836, 6.2.9200.26026, 6.3.9600.23132, 10.0.20348.5020, 10.0.25398.2274, 10.0.26100.32690 NVD
- Vendor
- Microsoft NVD
- Product
- Windows 10 Version 1607 NVD
- CWE
- CWE-362, CWE-416 NVD
How far exploitation has got
- No public code known
- Proof of concept
- Proof of concept, verified
- A Metasploit module
- Exploited in the wild
- Used in ransomware campaigns
Timeline
| 2026-04-14 | first spoke of it: Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Update Service allows an authorized attacker to elevate privileges locally. | NVD |
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Update Service allows an authorized attacker to elevate privileges locally.
What it is to other things
| affects | microsoft/windows_10_1607 NVD |
| affects | microsoft/windows_10_1809 NVD |
| affects | microsoft/windows_10_21h2 NVD |
| affects | microsoft/windows_10_22h2 NVD |
| affects | microsoft/windows_11_23h2 NVD |
| affects | microsoft/windows_11_24h2 NVD |
| affects | microsoft/windows_11_25h2 NVD |
| affects | microsoft/windows_11_26h1 NVD |
| affects | microsoft/windows_server_2012 NVD |
| affects | microsoft/windows_server_2016 NVD |
| affects | microsoft/windows_server_2019 NVD |
| affects | microsoft/windows_server_2022 NVD |
| affects | microsoft/windows_server_2022_23h2 NVD |
| affects | microsoft/windows_server_2025 NVD |
| made_by | microsoft NVD |
In words only, so not counted until a person confirms one:
| affects | microsoft/windows_10_version_1607NVD says “Microsoft · Windows 10 Version 1607” |
Every value, with what each source said and its receipt
| Property | Source | Said | Means here | ||||
|---|---|---|---|---|---|---|---|
| Automatable automatable | NVD | no At least one of those steps needs a person. receipt
What the source handed over{
"cve": {
"affected": [
{
"affectedData": [
{
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
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"vendor": "Microsoft",
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"status": "affected",
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"versionType": "custom"
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]
},
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"vendor": "Microsoft",
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"vendor": "Microsoft",
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{
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},
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"vendor": "Microsoft",
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},
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},
{
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"vendor": "Microsoft",
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"product": "Windows Server 2016",
"vendor": "Microsoft",
"versions": [
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"status": "affected",
"version": "10.0.14393.0",
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},
{
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"product": "Windows Server 2016 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
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"status": "affected",
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},
{
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"product": "Windows Server 2019",
"vendor": "Microsoft",
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{
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"status": "affected",
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},
{
"platforms": [
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"product": "Windows Server 2022",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "10.0.20348.0",
"versionType": "custom"
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]
},
{
"platforms": [
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"product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "10.0.25398.0",
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{
"platforms": [
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"product": "Windows Server 2025",
"vendor": "Microsoft",
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"status": "affected",
"version": "10.0.26100.0",
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]
}
],
"source": "secure@microsoft.com"
}
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Update Service allows an authorized attacker to elevate privileges locally."
}
],
"id": "CVE-2026-26174",
"lastModified": "2026-09-25T18:17:11.480",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"exploitation": "none"
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{
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{
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],
"role": "CISA Coordinator",
"timestamp": "2026-04-09T00:00:00+00:00",
"version": "2.0.3"
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}
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},
"published": "2026-04-14T18:16:52.353",
"references": [
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"tags": [
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}
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"vulnStatus": "Analyzed",
"weaknesses": [
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"lang": "en",
"value": "CWE-362"
},
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "secure@microsoft.com",
"type": "Secondary"
}
]
}
} | — | ||||
| CVSS cvss | NVD | 7receipt
What the source handed over{
"cve": {
"affected": [
{
"affectedData": [
{
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"x64-based Systems"
],
"product": "Windows 10 Version 1607",
"vendor": "Microsoft",
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"status": "affected",
"version": "10.0.14393.0",
"versionType": "custom"
}
]
},
{
"platforms": [
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"x64-based Systems"
],
"product": "Windows 10 Version 1809",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.17763.8644",
"status": "affected",
"version": "10.0.17763.0",
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]
},
{
"platforms": [
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"x64-based Systems"
],
"product": "Windows 10 Version 21H2",
"vendor": "Microsoft",
"versions": [
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"status": "affected",
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]
},
{
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],
"product": "Windows 10 Version 22H2",
"vendor": "Microsoft",
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},
{
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"vendor": "Microsoft",
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},
{
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{
"platforms": [
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"product": "Windows Server 2012 R2",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "6.3.9600.0",
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{
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"product": "Windows Server 2012 R2 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
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},
{
"platforms": [
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],
"product": "Windows Server 2016",
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} | — | ||||
| CVSS vector cvss_vector | NVD | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hreceipt
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]
}
} | — | ||||
| CWE cwe | NVD | CWE-362, CWE-416receipt
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]
}
} | — | ||||
| Exploitation exploitation | NVD | none No evidence of exploitation, and no public proof of concept. receipt
What the source handed over{
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} | — | ||||
| Fixed in fixed_in | NVD | 10.0.14393.9060, 10.0.17763.8644, 10.0.19044.7184, 10.0.19045.7184, 10.0.22631.6936, 10.0.26100.8246, 10.0.26200.8246, 10.0.28000.1836, 6.2.9200.26026, 6.3.9600.23132, 10.0.20348.5020, 10.0.25398.2274, 10.0.26100.32690receipt
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} | — | ||||
| Product product | NVD | Windows 10 Version 1607receipt
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]
}
} | — | ||||
| Severity severity | NVD | HIGH From 7.0 to 8.9. receipt
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} | high | ||||
| Status status | NVD | Analyzedreceipt
What the source handed over{
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} | — | ||||
| Technical impact technical_impact | NVD | total The attacker gains full control of the component, or all of its information. receipt
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} | — | ||||
| Vendor vendor | NVD | Microsoftreceipt
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} | — |
Every claim, by kind
vulnerability
| Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Update Service allows an authorized attacker to elevate privileges locally. zetlyn/cve-nvd · 2026-04-14 | automatable no cvss 7 cvss_vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H cwe CWE-362, CWE-416 exploitation none fixed_in 10.0.14393.9060, 10.0.17763.8644, 10.0.19044.7184, 10.0.19045.7184, 10.0.22631.6936, 10.0.26100.8246, 10.0.26200.8246, 10.0.28000.1836, 6.2.9200.26026, 6.3.9600.23132, 10.0.20348.5020, 10.0.25398.2274, 10.0.26100.32690 product Windows 10 Version 1607 severity HIGH status Analyzed technical_impact total vendor Microsoft | source |