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CVE-2026-78522 is an out-of-bounds read vulnerability in Microsoft Office Word. An unauthorized attacker can exploit the improper bounds handling to disclose information over a network. The vulnerability is addressed by Microsoft's September 8, 2026 security updates, including the update associated with KB5002923 for affected Click-to-Run Word products.
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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.
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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.
Out-of-bounds-read information-disclosure vulnerability in Microsoft Office Word.
Microsoft Word vulnerability addressed by KB5002923; the technical vulnerability type is not provided.
An out-of-bounds read vulnerability in Microsoft Office Word that permits an unauthorized attacker to disclose information over a network.
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.