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 197 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)
- 1.6% probability of exploitation in the next 30 days, higher than 75.3% of all scored CVEs
- CISA KEV
- Listed since 2026-08-18, federal remediation deadline 2026-08-21
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2026-04-14, last modified 2026-09-25
Is CVE-2026-33824 being exploited?
CISA added CVE-2026-33824 to the Known Exploited Vulnerabilities catalog on 2026-08-18, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-08-21 under BOD 22-01. Weaponised exploit code for CVE-2026-33824 is publicly available. 3 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 42 in the Threadlinqs vulnerability feed.
- EpSiLoNPoInTOrI/IKEV2-POC (github)
- kaleth4/CVE-2026-33824 (github)
- trickest/cve (trickest)
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. Because CVE-2026-33824 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-08-21. 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
5 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.
- CVE-2026-34486: Apache Tomcat EncryptInterceptor Bypass Actively Exploited in SnowLight and AI-Assisted Campaigns — HIGH · 2026-08-05
- 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
Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .