EUVD-2026-35669
GHSA-5632-qjr7-ch9q
Severity by source
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Office via a type confusion flaw (CWE-416) permits unauthorized attackers to run arbitrary code in the context of the Office process without requiring privileges or user interaction. The issue carries a high CVSS 3.1 score of 8.4 with full impact across confidentiality, integrity, and availability, though exploitation requires local attack vector access to the target system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access to the target system (CVSS AV:L) - the attacker must already be able to run code or interact with Office components on the host, ruling out purely remote network-based attacks. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H scores 8.4 and indicates low-complexity local exploitation with no privileges and no user interaction required, which is unusual for an Office bug - Office vulnerabilities are typically AV:N with UI:R (malicious document opened by the user). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained low-privileged local code execution on a workstation - for example via a phishing payload or a separate browser exploit - triggers the type confusion in a locally invoked Office component to execute code within the Office process context, which often runs with the interactive user's privileges and broader access to documents and credentials than the initial foothold. Because UI:N is set, no user must open a document for the secondary stage to fire, making this useful as a post-compromise escalation primitive. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update referenced in the MSRC entry at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45458 for each affected Office channel and SKU as soon as the patch is validated in your environment. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory Office deployments and assess user base at risk; restrict local access controls and disable unnecessary Office features pending mitigation. …
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Same weakness CWE-416 – Use After Free
View allSame technique Authentication Bypass
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External POC / Exploit Code
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