--- title: 'GitLost' Flaw Leaks Private Data from GitHub's Agentic... description: Researchers at Noma Security discovered a critical prompt injection vulnerability dubbed 'GitLost' in GitHub Agentic Workflows. An unauthenticated attacker can... canonical: https://daily.dev/posts/gitlost-flaw-leaks-private-data-from-github-s-agentic-workflows-jty8eoyaf twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: 'GitLost' Flaw Leaks Private Data from GitHub's Agentic Workflows | daily.dev og:description: Researchers at Noma Security discovered a critical prompt injection vulnerability dubbed 'GitLost' in GitHub Agentic Workflows. An unauthenticated attacker can... og:url: https://daily.dev/posts/gitlost-flaw-leaks-private-data-from-github-s-agentic-workflows-jty8eoyaf og:image: https://api.daily.dev/og/posts/jTY8EOyaf.png og:image:alt: 'GitLost' Flaw Leaks Private Data from GitHub's Agentic Workflows 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. # 'GitLost' Flaw Leaks Private Data from GitHub's Agentic Workflows **[Dark Reading](https://daily.dev/sources/dr)** · 5 min read · 0 upvotes · 0 comments ## Summary Researchers at Noma Security discovered a critical prompt injection vulnerability dubbed 'GitLost' in GitHub Agentic Workflows. An unauthenticated attacker can craft a malicious GitHub Issue in a public repository, embedding plain-English commands that trick the AI agent (backed by Claude or GitHub Copilot) into leaking data from the organization's private repositories. No credentials or coding skills are required — just opening an issue is enough. The flaw stems from the agent failing to maintain a trust boundary between system-level instructions and untrusted user content. GitHub was notified and reportedly updated its documentation. Defenders are advised to apply least-privilege access to AI agents, audit workflow configurations, and logically isolate untrusted user input from system prompts. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [‘GitLost’ Flaw Lets Attackers Trick GitHub AI Agent Into Leaking Private Repos](https://daily.dev/posts/gitlost-flaw-lets-attackers-trick-github-ai-agent-into-leaking-private-repos-h2sgta49s) · DevOps.com · 0 upvotes · 0 comments - [GitLost: GitHub's AI agent leaks private repos when asked](https://daily.dev/posts/gitlost-github-s-ai-agent-leaks-private-repos-when-asked-qlzfcubqe) · The Next Web · 2 upvotes · 1 comments - [GitHub AI agent leaks private repositories via prompt injection attack](https://daily.dev/posts/github-ai-agent-leaks-private-repositories-via-prompt-injection-attack-rd9immbqn) · CSO Online · 1 upvotes · 0 comments - [GitHub AI agent leaks private repos when asked nicely](https://daily.dev/posts/github-ai-agent-leaks-private-repos-when-asked-nicely-gkw3rhodd) · The Register · 89 upvotes · 24 comments --- Tags: [#github](https://daily.dev/tags/github), [#github-actions](https://daily.dev/tags/github-actions), [#ai-security](https://daily.dev/tags/ai-security), [#agentic-ai](https://daily.dev/tags/agentic-ai), [#prompt-injection](https://daily.dev/tags/prompt-injection) [View this post on daily.dev](https://daily.dev/posts/gitlost-flaw-leaks-private-data-from-github-s-agentic-workflows-jty8eoyaf) ```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":"'GitLost' Flaw Leaks Private Data from GitHub's Agentic Workflows","url":"https://daily.dev/posts/gitlost-flaw-leaks-private-data-from-github-s-agentic-workflows-jty8eoyaf","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/gitlost-flaw-leaks-private-data-from-github-s-agentic-workflows-jty8eoyaf"},"datePublished":"2026-07-07T16:14:55.662Z","dateModified":"2026-07-07T16:15:20.171Z","description":"Researchers at Noma Security discovered a critical prompt injection vulnerability dubbed 'GitLost' in GitHub Agentic Workflows. 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