EUVD-2026-35540
GHSA-9wv7-96q7-32pc
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Office Word is possible through an untrusted pointer dereference (CWE-125 out-of-bounds read) that an attacker can trigger by convincing a user to open a malicious document. The CVSS 7.8 vector (AV:L/AC:L/PR:N/UI:R) reflects high impact to confidentiality, integrity, and availability once the booby-trapped file is opened, though no public exploit identified at time of analysis and the issue is not listed in CISA KEV.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a specially crafted Word document in Microsoft Office Word on a system where the vulnerable parser path is reachable - this is the UI:R requirement. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 (High) accurately reflects a client-side, user-interaction-required code execution bug: AV:L plus UI:R means the victim must open a document locally, materially limiting mass exploitation versus a network-reachable RCE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Word document and delivers it via phishing email, a watering-hole site, or a shared file repository; the target opens the attachment in Word, the parser dereferences an attacker-controlled pointer while reading a malformed structure, and arbitrary code executes in the user's security context - enabling credential theft, lateral movement, or ransomware staging. Because UI:R is required, the attack relies on social engineering rather than a network-reachable service. |
| Remediation | Apply the Microsoft security update referenced in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45457 as soon as it is published for your Office channel (Patch available per vendor advisory; exact fix build not provided in the input data). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Enable email gateway filtering to block or sandbox Word attachments and issue a user advisory against opening unsolicited documents. …
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Microsoft Office Word contains an out-of-bounds read vulnerability that enables local code execution on affected systems
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally. [CVSS 8.4 HIGH]
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally. [CVSS 8.4 HIGH]
Local code execution in Microsoft Office Word arises from an untrusted pointer dereference (CWE-822) that can be trigger
Local code execution in Microsoft Office Word is possible when a user opens a maliciously crafted document that triggers
Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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