EUVD-2026-73835
GHSA-vf8f-4gmf-558x
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network-delivered via email requiring no auth; user must open or preview content; read-only memory leak means no integrity or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Out-of-bounds read in Microsoft Office Outlook allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Out-of-bounds read (CWE-125) in Microsoft Office Outlook allows a remote unauthenticated attacker to leak process memory contents when a victim opens or previews a crafted email message or attachment. All major Office branches are affected - Office 2016, 2019, LTSC 2021, LTSC 2024, and Microsoft 365 Apps for Enterprise - spanning hundreds of millions of endpoints globally. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open or preview a crafted email message or attachment within an unpatched version of Microsoft Office Outlook - user interaction is mandatory (UI:R) and prevents zero-click exploitation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 score appropriately reflects a network-exploitable information disclosure gated by mandatory user interaction, placing this at medium severity rather than critical. … 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 Microsoft's security updates released via Patch Tuesday, upgrading to the following minimum versions: Office 2016 to 16.0.5569.1002 or later, Microsoft 365 Apps for Enterprise to 16.0.20326.20136 or later, Office LTSC 2021 to 16.0.14334.20896 or later, Office 2019 to 16.0.10417.20204 or later, and Office LTSC 2024 to 16.0.17932.20960 or later. … 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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