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Outages & Breaches: October 2026 in numbers

6 significant outages (1 critical) and 17 data breaches (10 critical) were logged in October 2026. The largest breach by records was Capcom (11.8M). The most common outage cause was cyberattack (3 of 6). 2 of the incidents mainly affected the UK.

Most significant incidents

• 30 Oct 2026Florida financial aid site breach exposes 4.9 millionFlorida Dept of Education · breach · Unknown · 4.9M recordscritical
• 29 Oct 2026Binance suspends all trading after record hackBinance · outage · Cyberattackcritical
• 29 Oct 2026Binance heist estimated at $6.3B, the largest crypto theft on recordBinance · breach · TraderTraitor (North Korea)critical
• 28 Oct 2026Leak exposes 41,000 DHS staff, including undercover ICE agentsUS Department of Homeland Security · breach · Unknown · 41K recordscritical
• 28 Oct 2026Sony's Japanese ISP exposes 2.5 million customer recordsSony Network Communications · breach · Unknown · 2.5M recordscritical
• 23 Oct 2026Quest Diagnostics confirms patient records taken from QuanumQuest Diagnostics · breach · Unknowncritical
• 23 Oct 2026Capcom ID breach affects 11.8 million accountsCapcom · breach · Unknown · 11.8M recordscritical
• 17 Oct 20265.7 million California student records copiedCalifornia Dept of Education · breach · Unknown · 5.7M recordscritical

All 6 outages

• 30 Oct 2026Archive of Our Own stays offline after a security incidentArchive of Our Own · outage · Cyberattackmajor
• 30 Oct 2026Suspected cyberattack takes Sageworks bank risk platform offlineAbrigo Sageworks · outage · Cyberattackmajor
• 29 Oct 2026Binance suspends all trading after record hackBinance · outage · Cyberattackcritical
• 20 Oct 2026Google explains why backup power failed in its London outageGoogle Cloud (europe-west2) · outage · Power / coolingUKmajor
• 12 Oct 2026Configuration change takes down Exchange Admin CenterExchange Admin Center · outage · Configuration changeminor
• 8 Oct 2026Teams, SharePoint and Copilot fail for North American trafficMicrosoft 365 · outage · Unknownmajor

All 17 data breaches

• 30 Oct 2026Florida financial aid site breach exposes 4.9 millionFlorida Dept of Education · breach · Unknown · 4.9M recordscritical
• 30 Oct 2026Applebee's app left a database password exposedApplebee's · breach · Unknownmajor
• 29 Oct 2026Binance heist estimated at $6.3B, the largest crypto theft on recordBinance · breach · TraderTraitor (North Korea)critical
• 28 Oct 2026Leak exposes 41,000 DHS staff, including undercover ICE agentsUS Department of Homeland Security · breach · Unknown · 41K recordscritical
• 28 Oct 2026Sony's Japanese ISP exposes 2.5 million customer recordsSony Network Communications · breach · Unknown · 2.5M recordscritical
• 28 Oct 2026Japan Airlines passenger data taken in Amadeus breachJapan Airlines / Amadeus · breach · Unknown · 92K recordsmajor
• 27 Oct 2026University of Copenhagen breach exposes 525,000University of Copenhagen · breach · Unknown · 525K recordsmajor
• 27 Oct 2026GMO customer data posted after cloud desktop breachGMO Internet · breach · Unknownmajor
• 27 Oct 2026ENGIE French customer data stolen via partner marketing platformENGIE · breach · Unknownmajor
• 23 Oct 2026Quest Diagnostics confirms patient records taken from QuanumQuest Diagnostics · breach · Unknowncritical
• 23 Oct 2026Capcom ID breach affects 11.8 million accountsCapcom · breach · Unknown · 11.8M recordscritical
• 17 Oct 20265.7 million California student records copiedCalifornia Dept of Education · breach · Unknown · 5.7M recordscritical
• 16 Oct 2026Burger King Japan exposes 11.2 million recordsBurger King Japan · breach · Unknown · 11.2M recordscritical
• 12 Oct 2026Weak password exposes Denmark's population registerDenmark CPR register · breach · Unknown · 8.8M recordscritical
• 11 Oct 2026Malware exposes 8.7 million Daiichi Kosho customersNippon Columbia / Daiichi Kosho · breach · Unknown · 8.7M recordscritical
• 6 Oct 2026ASOS breach traced to social engineeringASOS · breach · Xuanye Group · 139K recordsUKmajor
• 4 Oct 2026DTU hack potentially exposes 200,000Technical University of Denmark · breach · Unknown · 200K recordsmajor