EUVD-2026-35668
GHSA-6gjp-59mg-98gh
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 stems from a type confusion (CWE-843) flaw that allows an unauthenticated attacker with local access to run arbitrary code in the context of the Office process. The CVSS 8.4 score reflects high impact on confidentiality, integrity, and availability without requiring privileges or user interaction, though the attack vector is local. No public exploit is identified at time of analysis and the issue is not listed in CISA KEV.
Technical ContextAI
Microsoft Office is a productivity suite (Word, Excel, PowerPoint, Outlook, etc.) that parses complex document formats including OOXML, legacy binary formats, and embedded objects. CWE-843 (Access of Resource Using Incompatible Type) - known as type confusion - occurs when code casts an object to a type that does not match its actual underlying memory layout, allowing attackers to manipulate memory through unexpected field offsets and method dispatch tables. In Office, such flaws typically arise in document parsers, OLE/ActiveX handling, or scripting integration where polymorphic objects are deserialized from untrusted file content, and successful exploitation often yields arbitrary read/write primitives that can be chained to code execution. The Microsoft MSRC advisory is the sole authoritative reference; no CPE strings were included in the input to pin exact SKUs or builds.
RemediationAI
Patch available per vendor advisory - apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45456 to every impacted Office installation through Microsoft Update, Click-to-Run, WSUS, or Intune as appropriate for the deployment channel. Until the update is deployed, reduce exposure by disabling the Outlook and File Explorer preview panes for Office documents (which removes a common no-click trigger surface for Office parser bugs, at the cost of usability), enforcing Protected View for files originating from the Internet and Outlook attachments, and blocking inbound Office documents at the email gateway from untrusted senders. Ensure Attack Surface Reduction rules (particularly 'Block Office applications from creating child processes' and 'Block executable content from email client and webmail') are enabled in audit-then-block mode, accepting that some macro-enabled workflows may break. The VulDB entry at https://vuldb.com/vuln/369664 may carry additional mitigation guidance as researchers update it.
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Same technique Authentication Bypass
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External POC / Exploit Code
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