CVE Intelligence
High Memory corruption

CVE-2026-73026 — Windows Biometric Service Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Biometric Service allows an authorized attacker to elevate privileges locally.

Published Sep 8, 2026 · Updated Oct 14, 2026 · Sources: CVE Program (cve.org) e CISA ADP · CNA: microsoft

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.3% (30-day exploitation probability)+4
  • Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.33%
ahead of 25% of scored CVEs · Oct 14, 2026
Affects
Microsoft
Windows 10 Version 1607 and 14 more
CVSS base
7.8
High · 1 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Microsoft Windows 10 Version 1607, Microsoft Windows 10 Version 1809, Microsoft Windows 10 Version 21H2…).
  2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  3. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Microsoft Windows 10 Version 1607 ≥ 10.0.14393.0 and < 10.0.14393.9512 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows 10 Version 1809 ≥ 10.0.17763.0 and < 10.0.17763.9245 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows 10 Version 21H2 ≥ 10.0.19044.0 and < 10.0.19044.7725 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows 10 Version 22H2 ≥ 10.0.19045.0 and < 10.0.19045.7725 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows 11 version 23H2 ≥ 10.0.22631.0 and < 10.0.22631.7582 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows 11 Version 24H2 ≥ 10.0.26100.0 and < 10.0.26100.9445 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows 11 Version 25H2 ≥ 10.0.26200.0 and < 10.0.26200.9445 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows 11 version 26H1 ≥ 10.0.28000.0 and < 10.0.28000.2954 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows Server 2016 ≥ 10.0.14393.0 and < 10.0.14393.9512 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows Server 2016 (Server Core installation) ≥ 10.0.14393.0 and < 10.0.14393.9512 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows Server 2019 ≥ 10.0.17763.0 and < 10.0.17763.9245 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows Server 2019 (Server Core installation) ≥ 10.0.17763.0 and < 10.0.17763.9245 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows Server 2022 ≥ 10.0.20348.0 and < 10.0.20348.5622 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows Server 2025 ≥ 10.0.26100.0 and < 10.0.26100.33438 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Windows Server 2025 (Server Core installation) ≥ 10.0.26100.0 and < 10.0.26100.33438 Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
7.8 CVSS 3.1 High — — microsoft via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C (score shown at the top: microsoft)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-122 · Heap-based Buffer Overflow

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
  • Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
endpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

  • 2026
  • Record published
    Oct 14, 2026
  • CVSS changed · 7.8
    Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
  • Source status changed · → Published
    Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
  • Record created in this database
    Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
  • CVE published
    Sep 8, 2026 · microsoft

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

1 on the record

Elsewhere on this site

Microsoft
every CVE for this vendor
Memory corruption
same class
CWE-122
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-97844 Role: DNS Server Information Disclosure Vulnerability 2d
  • CVE-2026-97843 Role: DNS Server Information Disclosure Vulnerability 2d
  • CVE-2026-97839 Role: DNS Server Information Disclosure Vulnerability 2d
  • CVE-2026-97840 Role: DNS Server Information Disclosure Vulnerability 2d
  • CVE-2026-97842 Role: DNS Server Information Disclosure Vulnerability 2d
  • CVE-2026-97841 Role: DNS Server Information Disclosure Vulnerability 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-73026 is "Windows Biometric Service Elevation of Privilege Vulnerability", rated High. It affects Windows 10 Version 1607 (Microsoft); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.8 describes technical severity. EPSS 0.33% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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