EUVD-2026-56462
GHSA-q563-hwx6-h22r
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-based local trigger (AV:L), no attacker privileges needed (PR:N), user must open file (UI:R), full code execution impact (C/I/A:H).
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 Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Untrusted pointer dereference in Microsoft Office Excel enables local arbitrary code execution when a user opens a crafted document. The flaw (CWE-822) allows an attacker who can deliver a malicious file to achieve full code execution with high confidentiality, integrity, and availability impact on the victim's system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively open a maliciously crafted Excel file - this is the UI:R condition confirmed by the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score reflects high impact (C:H/I:H/A:H) but a constrained attack surface: AV:L limits direct exploitation to the local system, and UI:R requires the victim to actively open a malicious file. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Excel workbook embedding a structure that causes an untrusted pointer dereference during file parsing, then delivers it to a target via a phishing email or compromised file share. The victim opens the file in Microsoft Excel, triggering the memory corruption and granting the attacker code execution under the victim's user context. … |
| Remediation | The primary remediation is to apply Microsoft's official patch via Windows Update or the Microsoft Update Catalog; the exact fixed build version is not independently confirmed from the available data and must be obtained from the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68810. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Microsoft Excel deployments and issue a mandatory user advisory prohibiting opening of unsolicited or unexpected Excel files, with particular emphasis on email attachments. …
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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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