Threat Intelligence / CVE / CVE-2026-33824

CVE-2026-33824 — Microsoft Office

CVSS v3.1 8.4 (HIGH) · EPSS 0.0% (higher than 20.9% of all scored CVEs) · Priority 5/10 · Published 2026-04-14

As of 2026-04-14, CVE-2026-33824 is a HIGH-severity vulnerability in Microsoft Office, CVSS v3.1 8.4, EPSS 0.0% (20.9th percentile). Threadlinqs Intelligence links 4 tracked threat campaigns to CVE-2026-33824, most recently “Microsoft's MDASH AI Scanning Harness Uncovers 16 Windows CVEs, Including Four Critical RCE Flaws in TCP/IP, IKEv2, Netlogon, and DNS”.

Last updated: 2026-04-14

What is CVE-2026-33824?

A remote code execution vulnerability exists in Microsoft Office and Outlook due to an OLE object handling bug. An attacker could exploit this vulnerability by sending a specially crafted email; previewing the email in the Outlook Preview Pane is sufficient to trigger exploitation without requiring the user to open the message. Successful exploitation allows arbitrary code execution in the context of the user. The vulnerability was disclosed as part of the Microsoft April 2026 Patch Tuesday release, which remediated 167 vulnerabilities. This CVE was rated Critical severity with a CVSS 8.4 base score. The Preview Pane attack vector significantly increases exploitability as no user interaction beyond viewing the email preview is required.

The record classifies CVE-2026-33824 under weakness class CWE-843. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 151 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 8.4 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (FIRST): 0.0% probability of exploitation in the next 30 days, higher than 20.9% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-04-14

Is CVE-2026-33824 being exploited?

It currently carries a trending score of 10 in the Threadlinqs vulnerability feed.

Affected products and versions

Microsoft: Office, Outlook

How to fix CVE-2026-33824

The record marks a vendor fix as available for CVE-2026-33824. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33824. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33824. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-33824

4 tracked threats in the Threadlinqs corpus reference CVE-2026-33824, either in the campaign’s CVE list or as an indicator on the campaign record.

Microsoft's MDASH AI Scanning Harness Uncovers 16 Windows CVEs, Including Four Critical RCE Flaws in TCP/IP, IKEv2, Netlogon, and DNS — CRITICAL · 2026-07-10
Microsoft April 2026 Patch Tuesday — 163 CVEs / 88 Advisories (CVE-2026-32201 SharePoint Zero-Day Exploited In-The-Wild, CVE-2026-33825 Defender EoP Public PoC, CVE-2026-33824 IKE RCE CVSS 9.8, CVE-2026-33827 TCP/IP Wormable RCE) — CRITICAL · 2026-04-19
CVE-2026-33824: Windows IKE Extensions Unauthenticated RCE via Double Free — CRITICAL · 2026-04-15
Microsoft April 2026 Patch Tuesday — 167 Flaws, 2 Zero-Days (SharePoint Spoofing CVE-2026-32201 + Defender EoP CVE-2026-33825) — CRITICAL · 2026-04-14

Sources

Seeded from threat-derived and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-33824 are available via the Threadlinqs MCP server (Purple tier). View plans →

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