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lg:pt-9 pb-6 lg:pb-9"><div class="prose prose-sm sm:prose-base"><p>For security issues with Hacker News, please visit <a href="https://news.ycombinator.com/security.html">https://news.ycombinator.com/security.html</a>.</p><p>Y Combinator considers the security of our systems and applications to be of the utmost importance.</p><h4>Reporting Security Vulnerabilities</h4><p>Y Combinator welcomes input from the security research community. Through responsible disclosure we hope to improve the security of our applications and user data. To that end, we encourage security researchers to notify us of any potential vulnerabilities uncovered to security@ycombinator.com. Reports received through this channel should receive a prompt reply and if you do not receive a timely response we ask that you please attempt to contact us again. To protect our users we also request that you please refrain from sharing information about any potential vulnerabilities with anyone outside of YC. Once we have confirmed the vulnerability and mitigation we hope that you will join us in an announcement.</p><h4>Exclusions</h4><p>While researching, we'd like to ask you to refrain from:</p><ul><li>Denial of service</li><li>Spamming</li><li>Social engineering (including phishing) of Y Combinator staff or contractors</li><li>Any physical attempts against Y Combinator property or data centers</li></ul><h4>Bug Bounties</h4><p>We do pay bug bounties at our discretion for significant vulnerabilities responsibly disclosed.</p><h4>Thanks!</h4><p>Thanks to the following people who have discovered and responsibly disclosed security holes in Y Combinator software.</p></div><div class="prose mt-8 lg:mt-12"><p><strong>20180304</strong> <a href="https://twitter.com/arkadiyt">Arkadiy Tetelman</a></p><ul><li>Our signature computation in SSO was vulnerable to an http parameter pollution attack that allowed account takeovers.</li></ul><p><strong>20180313</strong> <a href="https://www.linkedin.com/in/waiyanaun9/">Wai Yan Aung</a></p><ul><li>A static website that we served via S3 was leaking staff operating system usernames and ids.</li></ul><p><strong>20180429</strong> <a href="https://www.facebook.com/FlEx0Geek">Mohamed Sayed</a></p><ul><li>The YC blog's API was left enabled after a migration, no data was exposed but it should have been disabled.</li></ul><p><strong>20180501</strong> <a href="https://www.linkedin.com/in/waiyanaun9/">Wai Yan Aung</a></p><ul><li>Reported lack of SPF records on unused domains.</li></ul><p><strong>20180501</strong> <a href="https://www.linkedin.com/in/faizal-abroni-b87310110/">Faizal Abroni</a></p><ul><li>Reported that an unused subdomain could be hijacked via AWS Cloudfront</li></ul><p><strong>20180606</strong> <strong>nthack</strong></p><ul><li>Reported XSS vulnerabilities on www.workatastartup.com, fixed quickly. No data was exposed.</li></ul><p><strong>20180917</strong> <a href="https://www.philipithomas.com/">Philip Thomas</a></p><ul><li>Reported a vulnerability in Startup School that made founder email addresses accessible to other Startup School founders.</li></ul><p><strong>20181023</strong> <a href="https://www.philipithomas.com/">Philip Thomas</a></p><ul><li>Reported a vulnerability in our application that leaked recommendations that were left on previous applications.</li></ul><p><strong>20200714</strong> <a href="https://www.linkedin.com/in/pritam-mukherjee-urvil-b75ab9b9/">Pritam Mukherjee</a></p><ul><li>Reported an endpoint that needed to be rate limited.</li></ul><p><strong>20200720</strong> <a href="https://www.linkedin.com/in/shiraz-ali-khan-1ba508180">Shiraz Ali Khan</a></p><ul><li>Reported a missing DMARC record.</li></ul><p><strong>20201124</strong> <a href="http://linkedin.com/in/anil-bhatt-2760a1114">Anil Bhatt</a></p><ul><li>Reported that we were not stripping EXIF data from user-uploaded images</li></ul><p><strong>20210524</strong> <a href="https://www.linkedin.com/in/kuter-dinel-1987b81b1/">Kuter Dinel</a></p><ul><li>Discovered a vulnerability in how we use Algolia indexes</li></ul><p><strong>20220121</strong> <a href="http://shresthashishir.com.np/">Shishir Shrestha</a></p><ul><li>Discovered a stored XSS vulnerability.</li></ul><p><strong>20230812</strong> <a href="https://twitter.com/jerbi_nessim">Nessim Jerbi</a></p><ul><li>Discovered multiple XSS issues.</li></ul><p><strong>20231211</strong> <a href="https://www.linkedin.com/in/kuter-dinel-1987b81b1/">Kuter Dinel</a></p><ul><li>Discovered an OAuth Client Impersonation Attack</li></ul></div></section></div><footer aria-labelledby="footer-heading"><h2 id="footer-heading" class="sr-only">Footer</h2><div class="mx-auto max-w-ycdc-page py-12 lg:py-16"><div class="flex flex-col space-y-8 md:flex-row md:space-y-0"><div class="md:pr-16"><a class="block h-[45px] w-[45px] sm:h-[60px] sm:w-[60px]" href="/" 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