EUVD-2026-56423
GHSA-xc57-cq3p-j9vp
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
File-based local trigger with mandatory user interaction; no system privileges needed; impact confined to confidentiality with no write or availability consequence.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
3DescriptionNVD
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
AnalysisAI
Out-of-bounds read in Microsoft Office Word exposes high-confidentiality memory contents when a user opens a specially crafted document locally. Affected products span Word 2016, Office 2019, Office LTSC 2021/2024, and Microsoft 365 Apps for Enterprise, confirmed via EUVD-2026-56423. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation unconditionally requires the victim to actively open a specially crafted Word document (UI:R) - passive exposure such as file preview or indexing is not implied by available data. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.5 Medium score (5.5) with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N correctly captures the constrained exploitability: the local attack vector means an attacker cannot reach this over a network without first delivering the malicious file, and user interaction (UI:R) adds a mandatory social engineering step. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Word document containing specifically structured data designed to trigger an out-of-bounds read during Word's document parsing phase. The file is delivered to a target user via phishing email or a shared file location, and when the victim opens it, Word reads beyond the intended buffer boundary, disclosing in-process memory contents. … |
| Remediation | Apply vendor-released patches immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Information Disclosure
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External POC / Exploit Code
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