EUVD-2026-56752
GHSA-fc76-3hc4-hv86
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local vector because exploitation requires victim to open a crafted file; PR:N as no attacker system privileges needed; C:H for potential sensitive memory disclosure; no integrity or availability impact.
Primary rating from NVD.
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 allows an unauthorized attacker to disclose information locally.
AnalysisAI
Out-of-bounds read in Microsoft Office exposes memory contents to local information disclosure across a wide range of affected products including Word 2016, Office 2019, LTSC 2021/2024, Microsoft 365 Apps for Enterprise, and Office 365/LTSC for Mac. The CVSS vector (AV:L/UI:R/C:H) indicates exploitation requires a victim to open a specially crafted Office document, after which sensitive in-process memory can be disclosed to the attacker. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim actively open a specially crafted Microsoft Office document on an affected product version (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.5 Medium score reflects a bounded but real risk profile: AV:L constrains reachability to scenarios where the victim must open a crafted document, AC:L indicates no unusual preconditions, and the C:H impact means successful exploitation could expose significant in-process memory - potentially including credentials, cryptographic material, or document contents. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Word document containing a specially structured record that triggers the out-of-bounds read in the Office parsing engine, then delivers it to a target via email or a file-sharing link. When the victim opens the document, Office reads beyond the bounds of an internal buffer, and the leaked memory contents - which could include in-process data such as authentication tokens or document fragments - become accessible to the attacker through an embedded macro callback or exfiltration mechanism. … |
| Remediation | Microsoft has released patches across all affected product lines. … 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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