EUVD-2026-73828
GHSA-rh5r-r8cf-3qp8
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network delivery with no attacker privileges; user must open email triggering OOB read; read-only impact (C:H only, no integrity or availability effect).
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 in Microsoft Office Outlook allows a remote, unauthenticated attacker to disclose sensitive information from process memory by inducing a user to open or interact with a maliciously crafted email or document. Affected products span Outlook 2016 through Microsoft 365 Apps for Enterprise, covering a large portion of the enterprise desktop install base. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim user open or preview a specially crafted email or document in an affected version of Microsoft Outlook; the CVSS UI:R metric confirms this is a mandatory prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 (Medium) score reflects a real but bounded risk: confidentiality impact is rated High (memory disclosure), but integrity and availability are unaffected, and user interaction is required. … 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 the Microsoft Update Catalog. … 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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