Quick Read
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Former CISA Director Krebs said 3% of all critical vulnerabilities ever discovered were found in October 2026 alone, triggering a sector-wide patching scramble.
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CrowdStrike CEO George Kurtz warned smaller companies “don’t have the expertise” or money to find vulnerable systems, making them the most exposed targets.
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Okta led all five stocks with a 163% year-to-date gain, raising the question of whether Black October tailwinds are already priced in.
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In late October 2026, researchers using advanced AI models found critical flaws in PHP, the behind-the-scenes programming language that powers nearly 70% of websites, according to some W3Techs estimates cited by CNBC. A vulnerability is a coding mistake that lets an intruder slip inside. Governments and <a href="https://bitcomme.com/number-of-uk-businesses-in-financial-distress-at-two-decade-high/” title=”Number of UK businesses in financial distress ‘at two-decade high’”>businesses rushed to patch, and the scramble has been dubbed Black October. Former CISA Director Chris Krebs told CNBC’s Squawk Box on Oct. 23 that 3% of all critical vulnerabilities ever discovered had been found in the past month.
Haves and Have-Nots Will Feel Black October Differently
Krebs said large companies can use advanced models to secure their systems while small and midsize businesses will struggle, and he urged smaller firms to scan constantly, patch fast, or take legacy systems offline. George Kurtz, the chief executive of CrowdStrike (NASDAQ:CRWD), made the same point on Mad Money on Oct. 26: “The have-nots are the smaller companies that don’t have the expertise; they don’t have the money behind it. They can’t find all of these vulnerable systems that are out there. Those are the systems that I would be worried about.”
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Investors moved fast. On October 23, Qualys (NASDAQ:QLYS) rose 3.6%, Tenable(NASDAQ:TENB) 5.1%, Cloudflare (NYSE:NET) 7.1%, CrowdStrike 7.1%, and Okta (NASDAQ:OKTA) 6% The ranking below shows how directly the patching scramble feeds each company’s core business
