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CVE-2026-62870 is a use-after-free vulnerability in Microsoft Office Excel that can result in remote code execution. The flaw is described as occurring in Excel's memory management during object disposal operations in the parsing engine. An attacker can exploit the issue by delivering a specially crafted Excel document to a target and inducing the victim to open it. The vulnerability affects multiple Microsoft Office and Excel product lines, including Microsoft 365 Apps for Enterprise, Excel 2016, Office 2019, Office LTSC 2021, and Office LTSC 2024 on 32-bit and x64-based systems. The issue is classified as high severity with CVSS v3.1 8.8 and requires no authentication or prior privileges, but it does require user interaction.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical remote code execution vulnerability in Microsoft Office Excel caused by a use-after-free flaw in the parsing engine when handling specially crafted Excel files.
A high-severity remote code execution vulnerability in Microsoft Office Excel caused by a use-after-free condition.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.