EUVD-2026-56690
GHSA-r8p5-v2rq-634c
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local file-triggered OOB read requires user to open document (UI:R); no integrity or availability impact, confidentiality high due to memory disclosure.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Lifecycle Timeline
3DescriptionNVD
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
AnalysisAI
Out-of-bounds read (CWE-125) in Microsoft Office exposes sensitive memory contents to local attackers who can persuade a user to open a specially crafted document. Affected products span multiple Office generations including Office 2016, 2019, 2021, 2024, LTSC variants, and Microsoft 365 Apps for Enterprise on both Windows and macOS. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Local access is required - the CVSS vector (AV:L) confirms exploitation occurs on the target machine, not over a network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 5.5 (Medium) is consistent with the available signals: local attack vector, no privileges required, user interaction required, and high confidentiality impact with no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Office document containing a specially structured data stream that triggers an out-of-bounds read during parsing. The attacker delivers the file via email, shared drive, or web download and persuades the target to open it. … |
| Remediation | Patch available per vendor advisory. … 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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