Security readout for executives and security teams
Plain-English summary
This Windows vulnerability can let a local, already-authorized attacker gain higher privileges. It is not described as remotely exploitable. Business urgency is highest for broadly deployed Windows endpoints and servers, especially where standard users can log in. Microsoft lists an official update as available.
Executive priority
Treat as a high-priority patching item, not an emergency based on current evidence. It can raise attacker privileges after local access, increasing breach impact. Prioritize assets where many users log in or where compromise would affect critical operations.
Technical view
CVE-2026-25174 is a CWE-125 out-of-bounds read in Windows Extensible File Allocation Table. Microsoft rates it CVSS 7.8, AV:L/AC:L/PR:L/UI:N, with high confidentiality, integrity, and availability impact. Affected platforms include multiple Windows 10, Windows 11, and Windows Server versions. Exploit maturity is listed as unproven.
Likely exposure
Organizations running the listed Windows 10, Windows 11, or Windows Server versions may be exposed until Microsoft’s applicable security update is applied. Exposure requires local access with low privileges, so shared workstations, developer endpoints, jump hosts, and multi-user servers deserve priority review.
Exploitation context
The provided sources do not show active exploitation. CISA KEV is false in the bundle, and the CVSS exploit maturity value is unproven. The vulnerability is local privilege escalation, so it is more likely to be used after initial access than as an entry point.
Researcher notes
Evidence is limited to Microsoft/CVE metadata. No public exploit details, exploitation reports, or workaround specifics are included in the provided sources. The affected list is broad across client and server Windows releases; validate exact applicability through Microsoft’s update guide.
Mitigation direction
- Apply the Microsoft security update for CVE-2026-25174.
- Prioritize systems allowing non-admin interactive or remote logon.
- Include Server Core installations listed by Microsoft in patch scope.
- If patching is delayed, check Microsoft guidance for supported workarounds.
- Reduce unnecessary local user access on affected Windows systems.
Validation and detection
- Inventory Windows versions against Microsoft’s affected product list.
- Confirm applicable Microsoft security updates are installed.
- Review vulnerability scanner results for CVE-2026-25174 coverage.
- Check high-risk shared systems before lower-risk single-user devices.
- Monitor Microsoft’s advisory for revisions or additional guidance.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-25174 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: 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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: 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
Source materials
- CVE List V5 sourceCVE List V5
- Windows Extensible File Allocation Table Elevation of Privilege VulnerabilityCVE reference · vendor-advisory, patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.