EUVD-2026-56572
GHSA-2m8h-7r9c-g9xm
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Requires local file open (AV:L), no attacker privileges (PR:N), user must open crafted document (UI:R), impact is confidentiality-only via memory disclosure.
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 (Windows and macOS editions, including LTSC 2024, LTSC 2021, 2019, and 365 Apps) enables local information disclosure when a user opens a maliciously crafted document. The CVSS vector (AV:L/UI:R) confirms exploitation is constrained to local, user-triggered scenarios with no code execution or data modification capability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector (AV:L/PR:N/UI:R) confirms that exploitation requires the victim to actively open or interact with a maliciously crafted Office document on their local machine. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 5.5 (Medium) accurately reflects the real-world risk profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Office document (for example, a .docx or .xlsx file) engineered to trigger an out-of-bounds read in the Office parser, then delivers it to a target user via phishing email or a shared network drive. When the victim opens the file, Office reads beyond its allocated buffer boundary, and adjacent memory contents - potentially including sensitive in-memory data - become accessible to the attacker through a side-channel or embedded callback mechanism. … |
| Remediation | Microsoft has released patches for 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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