EUVD-2026-56570
GHSA-w2q6-rm48-2h84
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local vector and required user interaction confirmed by description; PR:N because no prior system privileges needed, only file delivery to user.
Primary rating from Vendor (microsoft).
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 sensitive memory contents to local attackers via crafted document files. Affected products span Word 2016 through Microsoft 365 Apps for Enterprise on both Windows and Mac platforms, covering a broad enterprise install base. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | User interaction is mandatory - the victim must actively open a specially crafted Word document (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.5 Medium score is consistent with the constrained threat model: AV:L requires the document to execute in a local context, and UI:R means the user must actively open the file, reducing opportunistic mass exploitation risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Word document with a specially structured file section designed to trigger the out-of-bounds read in the parser, then delivers it via spear-phishing email to a target within the affected organization. When the victim opens the document in an unpatched version of Word, the parser reads beyond its allocated buffer and the attacker - if able to observe output (e.g., via a macro or a second-stage payload) - may extract adjacent memory contents such as cached credentials or encryption material. … |
| Remediation | Apply vendor-released patches immediately via Microsoft Update or the Office deployment tools. … 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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