EUVD-2026-56696
GHSA-qccf-jxm6-539r
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local vector confirmed by document-open trigger; PR:N as no system privileges needed; UI:R mandatory; C:H for memory disclosure; no integrity or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Lifecycle Timeline
3DescriptionCVE.org
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's document parser enables local information disclosure across Windows and Mac product lines, including Office 2016, 2019, 2021, 2024 LTSC, and Microsoft 365 Apps. An attacker who supplies a crafted Word document can cause the application to read beyond allocated memory boundaries, leaking high-confidence memory contents to the attacker. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a target user actively opens a specially crafted Word document using an unpatched version of Microsoft Office Word on Windows or macOS. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.5 Medium score reflects a real but constrained threat: AV:L requires the malicious document to be opened on the target machine, UI:R requires the user to actively open it, and the impact is limited to confidentiality (C:H, I:N, A:N) with no scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious .docx file with a deliberately malformed structure designed to trigger the out-of-bounds read in Word's parser. The file is delivered via spear-phishing email or a compromised file share. … |
| Remediation | The primary remediation is applying the vendor-released patch via Microsoft Update or the Office deployment toolchain. … 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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