EUVD-2026-85727
GHSA-wc4q-w3hr-m2w2
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Email-delivered RCE over the network with no attacker privileges but mandatory victim interaction to open/preview the message, yielding full user-context compromise.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Microsoft Outlook Remote Code Execution Vulnerability
AnalysisAI
Remote code execution in Microsoft Outlook affects Microsoft 365 Apps for Enterprise, Office LTSC 2021, and Office LTSC 2024 when a targeted user opens or previews a specially crafted email message. The CVSS vector (AV:N/AC:L/PR:N/UI:R) indicates an unauthenticated remote attacker can trigger the flaw with no credentials, but success depends on the victim interacting with the malicious message - Outlook's Preview Pane is a plausible trigger surface for message-borne code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the targeted user to open or preview a crafted email in an affected client (Microsoft 365 Apps for Enterprise, Office LTSC 2021, or Office LTSC 2024) - the CVSS UI:R metric confirms mandatory victim interaction, and Outlook's Preview Pane is a typical trigger surface for such message-borne RCE. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority patching candidate given the product's massive footprint, though not an emergency. … 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 fix for CVE-2026-70125 as documented in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70125 - the input confirms a patch is available from the vendor, but no exact build or version number is supplied here, so use the MSRC update guide and the Office channel release notes to identify the specific remediated builds for Microsoft 365 Apps for Enterprise (Current, Monthly Enterprise, and Semi-Annual Enterprise Channels) and for Office LTSC 2021 and Office LTSC 2024, then deploy through Microsoft Update, Configuration Manager, or your Office update channel. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all endpoints running Microsoft 365 Apps for Enterprise, Office LTSC 2021, and Office LTSC 2024, confirm current build and update channel status, and prioritize patching for executive, finance, and other high-value mailboxes; enable automatic updates where not already enforced and validate that mail gateway protections actively quarantine malformed message content. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
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External POC / Exploit Code
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