EUVD-2026-56720
GHSA-h3x5-jw7p-ff7v
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 delivery mechanism; mandatory user interaction (UI:R); read-only memory disclosure maps to C:H with 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 Word's document parsing engine exposes sensitive in-process memory to a local attacker across Office 2016 through LTSC 2024 and macOS variants. Exploitation requires a victim to open a specially crafted document, making social engineering or phishing the primary delivery mechanism. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open a specially crafted document (UI:R mandatory), meaning the attack is entirely dependent on social engineering, phishing, or malicious file distribution - it cannot be triggered remotely without victim interaction. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.5 (Medium) accurately characterizes the constrained threat model: AV:L places delivery at the local system boundary, AC:L indicates no special configuration complexity, PR:N requires no attacker-side privileges, and UI:R mandates victim interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker constructs a malicious Word document - in .docx or a legacy format - engineered to trigger the out-of-bounds read in the document parser, then delivers it to a target via phishing email or a compromised download source. When the victim opens the file on an unpatched Windows or macOS system, Word's parser reads beyond the intended memory boundary, potentially leaking sensitive in-process data such as credentials, tokens, or document contents resident in memory. … |
| Remediation | Apply Microsoft's August 2026 security updates through Microsoft Update (Windows) or Microsoft AutoUpdate (macOS). … 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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