EUVD-2026-44216
GHSA-frx9-7h8f-gr63
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local vector and required user interaction confirmed by description; no privileges needed to craft the document; confidentiality impact only, no integrity or availability effect.
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
2DescriptionCVE.org
Use of uninitialized resource in Microsoft Office allows an unauthorized attacker to disclose information locally.
AnalysisAI
Uninitialized memory disclosure in Microsoft Office exposes sensitive data locally when a user interacts with a crafted document. The vulnerability, rooted in CWE-908 (Use of Uninitialized Resource), affects the full breadth of current Office deployments across Windows and macOS, including Office 2016 through LTSC 2024 and Microsoft 365 Apps for Enterprise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim open or interact with a specially crafted Office document on a system running an affected Office version (Office 2016 through LTSC 2024, or any supported 365 Apps for Enterprise release on Windows or macOS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.5 (Medium) reflects a local attack vector (AV:L) requiring user interaction (UI:R), which substantially constrains the exploitability compared to network-reachable vulnerabilities. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Office document specifically designed to trigger an uninitialized buffer read during parsing, then delivers it to a target via spear-phishing email or a compromised file share. When the victim opens the document in any affected Office version, the application processes the crafted content, reads uninitialized memory, and potentially exposes sensitive data - such as cached credentials, encryption keys, or other process-resident secrets - to the attacker through a secondary channel embedded in document metadata or a callback mechanism. … |
| Remediation | Apply the vendor-released patch through standard Microsoft Update channels; the authoritative advisory is published at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55042. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Local code execution in Microsoft Word (and Office/SharePoint components that render Word content) stems from an integer
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps, and the macOS editions) arises
Arbitrary code execution in Microsoft Office Word (and the broader Office/365/SharePoint family) arises from a stack-bas
Local code execution in Microsoft Office (including Microsoft 365 Apps for Enterprise, Office 2016/2019, and Office LTSC
Local code execution in Microsoft Word (part of Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, and Office for M
Local arbitrary code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps for Enterprise, and O
Arbitrary code execution in Microsoft PowerPoint (and the broader Microsoft Office/365 suite on Windows and macOS) arise
Local code execution in Microsoft Office PowerPoint (including Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, a
Local code execution in Microsoft Office PowerPoint (CWE-122 heap-based buffer overflow) lets an unauthorized attacker r
Local code execution in Microsoft Word (and the wider Microsoft Office / Microsoft 365 Apps family) lets an unauthorized
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps for Enterprise, and Office for
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps, and Office for Mac 2021/2024)
Same weakness CWE-908 – Use of Uninitialized Resource
View allSame technique Information Disclosure
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External POC / Exploit Code
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