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CVE-2026-45461 is a critical memory-corruption vulnerability in Microsoft Office caused by a use-after-free condition. Available reporting also describes the issue as a heap-based memory corruption flaw within Office. Successful exploitation allows an unauthorized attacker to execute code locally on the affected system. Microsoft has indicated that the Preview Pane is an attack vector, meaning exploitation may be possible during document rendering without the user fully opening the file in the traditional editing view. The vulnerability affects Microsoft Office products and is part of a broader set of Office memory-corruption issues addressed in the June 2026 security updates.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical Microsoft Office remote code execution vulnerability with a Preview Pane attack vector, highlighted as a priority patch.
One of multiple heap-based buffer overflow vulnerabilities in Microsoft Office that could allow unauthenticated remote code execution.
A critical local code execution vulnerability in Microsoft Office caused by a use-after-free flaw.
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.