EUVD-2026-56712
GHSA-5x9p-4gjr-5pr3
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local file-open trigger requires active user interaction but zero attacker OS privilege; full user-session compromise with unchanged scope aligns with document-parser exploitation pattern.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Untrusted pointer dereference in Microsoft Office allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution via untrusted pointer dereference in Microsoft Office affects multiple product lines - Microsoft 365 Apps for Enterprise, Office 2019, Office LTSC 2021/2024, and Mac editions - when a victim opens a specially crafted document. The root cause (CWE-822) enables memory corruption through unvalidated pointer values sourced from attacker-controlled file content, yielding full confidentiality, integrity, and availability compromise of the targeted user session. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively open a specially crafted Office document on a system running an unpatched version of one of the affected products (Microsoft 365 Apps for Enterprise, Office 2019, Office LTSC 2021/2024, or the Mac equivalents). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score reflects a realistic local-execution scenario with low attack complexity and no required attacker privileges, though user interaction (opening a crafted file) is a hard prerequisite. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Office document embedding a forged pointer value within a parsed record structure, then delivers it to a target employee via a phishing email or a compromised shared file repository. When the victim opens the document in an unpatched Office installation, the parser dereferences the untrusted pointer, corrupting memory and transferring execution control to attacker-supplied shellcode, achieving arbitrary code execution under the victim's user account. … |
| Remediation | The primary remediation is to apply the vendor-released patch via Microsoft Update or the Microsoft 365 update channel as documented at https://aka.ms/OfficeSecurityReleases; macOS users must update to Office build 16.112.26081010 or later via Microsoft AutoUpdate. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all affected Office deployments by version (Microsoft 365 Apps for Enterprise, Office 2019, Office LTSC 2021/2024, and Mac editions) in your environment through asset management systems; escalate to business units with affected systems and restrict opening untrusted documents pending patch availability. …
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Same weakness CWE-822 – Untrusted Pointer Dereference
View allSame technique Authentication Bypass
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External POC / Exploit Code
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