Security readout for executives and security teams
Plain-English summary
A highly privileged local user on an affected Windows Hyper-V system could bypass intended access controls and read sensitive information. The flaw does not provide remote access or directly alter or disrupt systems, but disclosed data could support further compromise.
Executive priority
Schedule remediation through the normal security-update cycle, with faster treatment for sensitive or shared Hyper-V hosts. Emergency response is not supported by the supplied evidence because exploitation requires privileged local access and no active exploitation is reported.
Technical view
CVE-2026-20825 is an improper access control issue in Windows Hyper-V (CWE-284). Its CVSS 3.1 vector indicates local access, low complexity, high privileges, no user interaction, unchanged scope, high confidentiality impact, and no integrity or availability impact.
Likely exposure
Exposure is concentrated in Hyper-V hosts using the listed Windows 10, Windows 11, or Windows Server releases. Risk is higher where administrators, service accounts, or other highly privileged local identities are insufficiently controlled. The supplied evidence does not establish exposure for unlisted products or versions.
Exploitation context
The attacker must already have high privileges and local access, substantially limiting initial exploitation opportunities. The bundle marks this CVE as absent from KEV and reports exploit maturity as unproven. There is no supplied evidence of active exploitation.
Researcher notes
The CVSS score is 4.4. Confidentiality impact is rated high, while integrity and availability impacts are none. Remediation is reported as official, but the bundle does not identify individual update numbers or fixed builds; consult Microsoft’s advisory for exact platform-specific guidance.
Mitigation direction
- Review Microsoft’s advisory and apply the applicable security update for each affected Windows release.
- Prioritize Hyper-V hosts containing sensitive workloads or data.
- Restrict local administrative and other highly privileged access to Hyper-V systems.
- Monitor Microsoft guidance for revised affected-version or remediation information.
Validation and detection
- Inventory Hyper-V hosts and record their Windows product, release, and build.
- Compare each host against Microsoft’s current affected-product and security-update guidance.
- Verify applicable security updates are installed successfully on affected hosts.
- Review privileged local access and remove unnecessary administrative permissions.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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 lookupCVE-2026-20825 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
- Medium
- CVSS
- 4.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/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.
SSVC decision data
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:H/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C0.83.6microsoftVulnerability scoring details
Base CVSS 3.1 score
4.4MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Windows Hyper-V Information Disclosure VulnerabilityCVE reference, microsoft · 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.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.