EUVD-2026-73825
GHSA-3pwp-3q27-5xqq
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network delivery via email, no attacker privileges needed, user must open/preview content; full C/I/A impact consistent with code execution in user context.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Outlook stems from CWE-908 (use of uninitialized resource), enabling a network-based attacker to execute arbitrary code on a victim's machine without requiring authentication. The CVSS vector (PR:N/UI:R) indicates the attack requires no attacker credentials but does require user interaction - consistent with a malicious email or attachment that triggers uninitialized memory access when opened or previewed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | User interaction is required - the victim must open or preview the malicious message in an affected Outlook client (UI:R per CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score with vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H reflects a high-severity, low-complexity network-reachable flaw requiring only a single user interaction, which is consistent with email-delivered phishing or a malicious attachment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patches immediately via Microsoft Update or Click-to-Run automatic updates: Outlook 2016 must reach build 16.0.5569.1000 or later, Office LTSC 2024 must reach 16.0.17932.20960, Office LTSC 2021 must reach 16.0.14334.20896, Office 2019 must reach 16.0.10417.20204, and Microsoft 365 Apps for Enterprise must reach 16.0.20326.20136. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Outlook versions deployed across the enterprise, particularly Microsoft 365 Apps for Enterprise and perpetual editions (2016, 2019), and distribute advisory to users warning against opening suspicious email attachments or enabling previews from untrusted senders until patches are applied. …
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Same weakness CWE-908 – Use of Uninitialized Resource
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External POC / Exploit Code
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