EUVD-2026-73878
GHSA-8x7m-gqw5-vpwf
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local file-open trigger requires UI:R but no system credentials (PR:N); successful heap overflow yields full code execution under user context.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Heap-based buffer overflow in Microsoft Office Excel enables local code execution when a victim opens a specially crafted Excel file. Affected products span Excel 2016 through Microsoft 365 Apps for Enterprise and LTSC 2024 editions, including Mac variants. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a specially crafted Excel file on a system running a vulnerable version of Microsoft Excel or Office. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score reflects a file-based local execution scenario: AV:L requires the victim to open a malicious document, PR:N confirms no system credentials are needed by the attacker, and UI:R captures the required user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's released patches immediately via Windows Update, Microsoft Update Catalog, or Microsoft 365 Admin Center. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit your Office deployment inventory to identify affected versions (Excel 2016, Microsoft 365 Apps for Enterprise, LTSC 2024, and Mac variants). …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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