Windows Fax and Scan Service Elevation of Privilege Vulnerability
Assessment
Heap-based buffer overflow in Windows Fax and Scan Service allows an authorized attacker to elevate privileges locally.
- Severity
- Important
- CVSS base score
- 7.8CVSS:3.1/
AV:L/ AC:L/ PR:L/ UI:N/ S:U/ C:H/ I:H/ A:H/ E:U/ RL:O/ RC:C - Impact
- Elevation of Privilege
- EPSS, next 30 days
- 0.2%Higher than 15.6% of scored CVEs · FIRST model run 25 Oct 2026 · about EPSS
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Not assessed
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Windows Fax and Scan Service
- Weakness
- CWE-122: Heap-based Buffer Overflow
- Issued by
- Microsoft
- Published
- 13 Oct 2026 · October 2026
- Last revised
- 13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
- Attack vector
- LocalAV:L
- Attack complexity
- LowAC:L
- Privileges required
- LowPR:L
- User interaction
- NoneUI:N
- Scope
- UnchangedS:U
- Confidentiality
- HighC:H
- Integrity
- HighI:H
- Availability
- HighA:H
Updates that fix it
10 KBs| KB | Type | Restart | Applies to | Known issues | Other CVEs |
|---|---|---|---|---|---|
| KB5122871 | Security Update | Required | Windows Server 2025, Windows Server 2025 (Server Core installation) | MitigatedUSB audio devices might fail to start or produce no sound | All CVEs in KB5122871 |
| KB5122876 | Security Update | Required | Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 1 more | MitigatedUSB audio devices might fail to start or produce no sound | All CVEs in KB5122876 |
| KB5122878 | Security Update | Required | Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems and 3 more | MitigatedUSB audio devices might fail to start or produce no sound | All CVEs in KB5122878 |
| KB5122880 | Security Update | Required | Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems | MitigatedUSB audio devices might fail to start or produce no sound | All CVEs in KB5122880 |
| KB5122882 | Security Update | Required | Windows Server 2022, Windows Server 2022 (Server Core installation) | ResolvedUSB audio devices might fail to start or produce no sound | All CVEs in KB5122882 |
| KB5123065 | Security Update | Required | Windows Server 2012, Windows Server 2012 (Server Core installation) | None listed | All CVEs in KB5123065 |
| KB5123066 | Security Update | Required | Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) | None listed | All CVEs in KB5123066 |
| KB5123099 | Security Update | Required | Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016 and 1 more | MitigatedUSB audio devices might fail to start or produce no sound | All CVEs in KB5123099 |
| KB5124008 | Security Update | Required | Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 1 more | MitigatedUSB audio devices might fail to start or produce no soundResolvedDomain-joined devices might lose their secure trust relationship with the domain | All CVEs in KB5124008 |
| KB5124012 | Security Update | Required | Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems | MitigatedUSB audio devices might fail to start or produce no soundResolvedDomain-joined devices might lose their secure trust relationship with the domain | All CVEs in KB5124012 |
Affected products
ESU, Windows30 affected products
- Windows 10 Version 1607 for 32-bit Systems
- Windows 10 Version 1607 for x64-based Systems
- Windows 10 Version 1809 for 32-bit Systems
- Windows 10 Version 1809 for x64-based Systems
- Windows 10 Version 21H2 for 32-bit Systems
- Windows 10 Version 21H2 for ARM64-based Systems
- Windows 10 Version 21H2 for x64-based Systems
- Windows 10 Version 22H2 for 32-bit Systems
- Windows 10 Version 22H2 for ARM64-based Systems
- Windows 10 Version 22H2 for x64-based Systems
- Windows 11 Version 23H2 for ARM64-based Systems
- Windows 11 Version 23H2 for x64-based Systems
- Windows 11 Version 24H2 for ARM64-based Systems
- Windows 11 Version 24H2 for x64-based Systems
- Windows 11 Version 25H2 for ARM64-based Systems
- Windows 11 Version 25H2 for x64-based Systems
- Windows 11 Version 26H1 for ARM64-based Systems
- Windows 11 version 26H1 for x64-based Systems
- Windows Server 2012
- Windows Server 2012 (Server Core installation)
- Windows Server 2012 R2
- Windows Server 2012 R2 (Server Core installation)
- Windows Server 2016
- Windows Server 2016 (Server Core installation)
- Windows Server 2019
- Windows Server 2019 (Server Core installation)
- Windows Server 2022
- Windows Server 2022 (Server Core installation)
- Windows Server 2025
- Windows Server 2025 (Server Core installation)
What changed
First observed 14 Oct 2026- 25 Oct 2026 · 17:12:51 UTC EPSS0.2%; scored 24 Oct 2026 → 0.2%; scored 25 Oct 2026
- 25 Oct 2026 · 01:34:18 UTC EPSS0.2%; scored 23 Oct 2026 → 0.2%; scored 24 Oct 2026
- 23 Oct 2026 · 15:51:28 UTC EPSS0.2%; scored 22 Oct 2026 → 0.2%; scored 23 Oct 2026
- 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
- 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
- 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
- 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
- 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
- 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
- 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
- 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
- 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
Show 12 more recent changes
- 23 Oct 2026 · 08:31:50 UTCSource coverage: first-epss Current → Incomplete
- 23 Oct 2026 · 08:31:50 UTCSource coverage: cisa-kev Current → Incomplete
- 23 Oct 2026 · 08:31:50 UTCSource coverage: msrc-cvrf Current → Incomplete
- 22 Oct 2026 · 17:33:15 UTCEPSS 0.2%; scored 21 Oct 2026 → 0.2%; scored 22 Oct 2026
- 21 Oct 2026 · 21:47:24 UTCEPSS 0.2%; scored 20 Oct 2026 → 0.2%; scored 21 Oct 2026
- 20 Oct 2026 · 20:53:31 UTCEPSS 0.2%; scored 19 Oct 2026 → 0.2%; scored 20 Oct 2026
- 19 Oct 2026 · 15:12:40 UTCEPSS 0.2%; scored 18 Oct 2026 → 0.2%; scored 19 Oct 2026
- 18 Oct 2026 · 14:54:30 UTCEPSS 0.2%; scored 16 Oct 2026 → 0.2%; scored 18 Oct 2026
- 18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves
- 16 Oct 2026 · 16:13:25 UTCEPSS 0.2%; scored 15 Oct 2026 → 0.2%; scored 16 Oct 2026
- 15 Oct 2026 · 21:30:54 UTCEPSS 0.2%; scored 14 Oct 2026 → 0.2%; scored 15 Oct 2026
- 15 Oct 2026 · 01:07:54 UTCEPSS Not scored → 0.2%; scored 14 Oct 2026
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Explore global source statements, affected packages and advisory history for CVE-2026-87707. The catalog has a separate collection scope from Microsoft release records.
Explicit identifiers and source references
These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.
CVE-2026-87707 · Microsoft / collected KEV context
cve-program · CVE-2026-87707
Related operational evidence
Explicit CVE identifiers- Windows Fax and Scan Service Elevation of Privilege Vulnerability · Published vulnerability · 13 Oct 2026