EUVD-2026-56693
GHSA-9mcm-3jwv-v4xr
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local file-open trigger sets AV:L and UI:R; no privileges needed; only memory disclosure occurs, so C:H with I:N and A:N.
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 (CWE-125) in Microsoft Office Word exposes memory contents to a local, unauthenticated attacker who can trick a user into opening a crafted document, resulting in high-confidence information disclosure with no integrity or availability impact. The vulnerability spans eight distinct Office product lines across Windows and Mac, including Office 2016 through LTSC 2024 and Microsoft 365 Apps for Enterprise, broadening the exposure surface considerably. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target user actively opens a specially crafted Word document on a system running an unpatched version of Microsoft Office Word. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.5 (Medium) is internally consistent: AV:L constrains the attack to the victim's local session, UI:R requires an active user action (opening a file), and the impact is limited strictly to confidentiality (C:H, I:N, A:N), making this a targeted information-disclosure class rather than a remote code execution risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Word document engineered to trigger the out-of-bounds read in the file parser and delivers it to a targeted user via spear-phishing email or a compromised file share. When the victim opens the document in an unpatched version of Word, the parser reads beyond its allocated buffer, potentially leaking fragments of in-process memory - which may include cached credentials, session tokens, or other sensitive data held in the Word process address space. … |
| Remediation | The primary fix is to apply the vendor-released patch via standard Microsoft Office update channels. … 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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