EUVD-2026-56575
GHSA-xv49-v556-j4m7
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local vector confirmed by description; user interaction required to open crafted file; no integrity or availability impact; confidentiality fully compromised on vulnerable system.
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
Improper input validation in Microsoft Office allows an unauthorized attacker to disclose information locally.
AnalysisAI
Local information disclosure in Microsoft Office stems from improper input validation (CWE-20), allowing a local attacker who can induce user interaction to read sensitive data from the affected system. Affected products span Microsoft 365 Apps for Enterprise, Office LTSC 2021/2024, Office 2019, and Office 365/LTSC for Mac, with Mac builds patched at 16.112.26081010 and Windows builds addressed via the Microsoft Office Security Releases channel. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to be running a vulnerable version of Microsoft Office on either macOS or Windows and to open or interact with a specially crafted file (UI:R - user interaction is mandatory). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.5 (Medium) reflects a local-only, user-interaction-required flaw with high confidentiality impact but 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 designed to trigger the improper input validation flaw and emails it to a target user. The user opens the file, causing Office to process the malicious input and inadvertently expose sensitive data from local memory or files to the attacker - for example via a document that reads and embeds local file content upon render. … |
| Remediation | The primary fix is to apply the vendor-released patch: for Mac-based Office products (Office 365 for Mac, Office LTSC for Mac 2021/2024), update to version 16.112.26081010 or later via Microsoft AutoUpdate or the Mac App Store. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-20 – Improper Input Validation
View allSame technique Information Disclosure
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External POC / Exploit Code
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