Security readout for executives and security teams
Plain-English summary
CVE-2026-24289 is a Windows Kernel local privilege escalation flaw. An attacker who already has authorized local access could abuse a use-after-free bug to gain higher privileges. This is not a remote entry point, but it can turn a foothold on a Windows device or server into full system compromise.
Executive priority
Patch in the next normal high-priority Windows remediation cycle. Escalate faster for systems where many users can log in locally or where compromise would grant access to sensitive business systems.
Technical view
The vulnerability is CWE-416 use-after-free in the Windows Kernel. CVSS 3.1 is 7.8 with local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impact. Microsoft lists Windows client and server releases as affected and provides an MSRC advisory tagged as a patch reference.
Likely exposure
Exposure is likely wherever the listed Windows 10, Windows 11, and Windows Server versions remain unpatched, including Server Core installations. Risk is highest on shared workstations, RDS hosts, developer machines, domain-joined endpoints, and servers where low-privileged users or compromised accounts can run local code.
Exploitation context
The bundle does not show CISA KEV listing or cite active exploitation. The CVSS vector marks exploit maturity as unproven. Treat this as a serious post-compromise escalation risk, not confirmed internet-scale exploitation based on the provided evidence.
Researcher notes
The provided evidence identifies class, impact, CVSS, affected Windows releases, and Microsoft advisory reference, but not root-cause details, exploit primitives, or specific fixed build numbers. Avoid assuming active exploitation or workarounds unless Microsoft or KEV later confirms them.
Mitigation direction
- Apply the Microsoft security update referenced by the MSRC advisory.
- Prioritize internet-adjacent servers, shared hosts, and high-value workstations.
- Restrict local logon and code execution rights where not required.
- Monitor Microsoft guidance for revised affected builds or mitigation notes.
- Use endpoint controls to reduce unauthorized local execution.
Validation and detection
- Inventory Windows builds against the affected product list.
- Confirm March 2026 or later relevant Microsoft security updates are installed.
- Review vulnerability scanner results for CVE-2026-24289 coverage.
- Check high-value systems first: servers, admin workstations, and RDS hosts.
- Verify no unsupported Windows versions remain exposed without compensating controls.
Public sources used
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-416: 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-2026-24289 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.
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:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9microsoftVulnerability 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
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 Kernel Elevation of Privilege 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.