EUVD-2026-73830
GHSA-58hg-pc4g-m952
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network-delivered attack requires user to open crafted file (UI:R); read-only out-of-bounds primitive yields high confidentiality loss with no integrity or availability impact (I:N/A:N).
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 execute code over a network.
AnalysisAI
Out-of-bounds read in Microsoft Office Outlook and closely related Office suite components exposes sensitive in-memory data to network-based attackers who can deliver a crafted document to a user. The CVSS vector (C:H/I:N/A:N) and CWE-125 (Out-of-bounds Read) align on an information-disclosure primary impact, while Microsoft's description references code execution - a material discrepancy that warrants verification against the full MSRC advisory. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target user to actively open or preview a specially crafted Office document or email attachment - user interaction is mandatory (UI:R in CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 6.5 with vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N classifies this as Medium severity, with real-world impact best understood as information disclosure rather than direct code execution. … 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 patches detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78520. … 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
View allShare
External POC / Exploit Code
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