--- title: OpenAI was breached by a smarter model, not a new bug description: A security research team named Hacktron failed for hours to exploit a known bug in an old image-processing library used by OpenAI's help forum. The same... canonical: https://daily.dev/posts/openai-was-breached-by-a-smarter-model-not-a-new-bug-bgdul0oun twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: OpenAI was breached by a smarter model, not a new bug | daily.dev og:description: A security research team named Hacktron failed for hours to exploit a known bug in an old image-processing library used by OpenAI's help forum. The same... og:url: https://daily.dev/posts/openai-was-breached-by-a-smarter-model-not-a-new-bug-bgdul0oun og:image: https://api.daily.dev/og/posts/Bgdul0OuN.png og:image:alt: OpenAI was breached by a smarter model, not a new bug og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # OpenAI was breached by a smarter model, not a new bug **[Kilo Blog](https://daily.dev/sources/kilo-ai-blog)** · 4 min read · 0 upvotes · 0 comments ## Summary A security research team named Hacktron failed for hours to exploit a known bug in an old image-processing library used by OpenAI's help forum. The same evening Anthropic released Claude Opus 5, and pointing the new model at the identical bug produced a working exploit in three hours, remote code execution by the next morning, and access to an employee's ChatGPT and Codex accounts by afternoon. OpenAI fixed the issue within a day and paid a $6,500 bounty. The piece argues this shows attacker capability can jump overnight with a single model release, and pitches Kilo's model-agnostic Code Reviewer, Auto Frontier/Auto Efficient model rotation, and Codebase Indexing as ways defenders can keep pace. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How did a new Claude model release lead to a breach of OpenAI's help forum? Security researchers at Hacktron had failed for hours to exploit a known bug in an old image-processing library used by OpenAI's Discourse-based help forum. The same evening Anthropic released Claude Opus 5, they pointed it at the same bug and had a working exploit in three hours, remote code execution by the next morning, and access to an employee's ChatGPT and Codex accounts by early afternoon. _Teams tracking how fast new models change the security landscape can follow cases like this on daily.dev._ ### What was the underlying vulnerability that let researchers breach OpenAI's forum using Claude Opus 5? The exploit relied on a known bug in an old image-processing library (handling formats like HEIC or AVIF) embedded in OpenAI's help forum software, a bug that had actually been patched over a year earlier without being flagged as a security issue. Because it was never listed in a public vulnerability database, standard scanners that check packages against known-bug lists would not have caught it. _Developers auditing dependencies for silently-patched bugs can dig into writeups like this via daily.dev._ --- Tags: [#security](https://daily.dev/tags/security), [#openai](https://daily.dev/tags/openai), [#claude](https://daily.dev/tags/claude), [#ai-security](https://daily.dev/tags/ai-security) [View this post on daily.dev](https://daily.dev/posts/openai-was-breached-by-a-smarter-model-not-a-new-bug-bgdul0oun) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"OpenAI was breached by a smarter model, not a new bug","url":"https://daily.dev/posts/openai-was-breached-by-a-smarter-model-not-a-new-bug-bgdul0oun","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/openai-was-breached-by-a-smarter-model-not-a-new-bug-bgdul0oun"},"datePublished":"2026-10-11T12:29:28.945Z","dateModified":"2026-10-11T12:37:03.666Z","description":"A security research team named Hacktron failed for hours to exploit a known bug in an old image-processing library used by OpenAI's help forum. 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The same evening Anthropic released Claude Opus 5, they pointed it at the same bug and had a working exploit in three hours, remote code execution by the next morning, and access to an employee's ChatGPT and Codex accounts by early afternoon. Teams tracking how fast new models change the security landscape can follow cases like this on daily.dev."}},{"@type":"Question","name":"What was the underlying vulnerability that let researchers breach OpenAI's forum using Claude Opus 5?","acceptedAnswer":{"@type":"Answer","text":"The exploit relied on a known bug in an old image-processing library (handling formats like HEIC or AVIF) embedded in OpenAI's help forum software, a bug that had actually been patched over a year earlier without being flagged as a security issue. Because it was never listed in a public vulnerability database, standard scanners that check packages against known-bug lists would not have caught it. 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