Syntax: kev:true severity:critical epss:>0.95 vendor:cisco patch:false
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Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
CVE-2026-21509
HIGH CVSS 7.8 KEV
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Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.