--- title: "Breaking Opus 4.7 with ChatGPT (Hacking Claude's Memory) · Embrace The Red" url: https://daily.dev/posts/breaking-opus-4-7-with-chatgpt-hacking-claude-s-memory-embrace-the-red-i3pdz3zfb source_url: https://embracethered.com/blog/posts/2026/breaking-opus-4.7-with-chatgpt/ type: article source: "Embrace The Red" published: 2026-04-18T00:28:53.583Z updated: 2026-04-18T00:29:14.118Z tags: ["claude", "ai-security", "prompt-injection"] reading_time: 8 upvotes: 1 comments: 0 language: 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. # Breaking Opus 4.7 with ChatGPT (Hacking Claude's Memory) · Embrace The Red **[Embrace The Red](https://daily.dev/sources/embracethered)** · 8 min read · 1 upvotes · 0 comments ## Summary A security researcher demonstrates an indirect prompt injection attack against Claude Opus 4.7 using a ChatGPT-generated adversarial image. The image embeds a social engineering puzzle that tricks Claude into invoking its memory tool and persisting false user information (fake name, age, occupation) across future conversations. The attack succeeded 5 out of 10 times, even though Opus detected suspicious activity each time. The post details the attack methodology, Anthropic's memory tool system prompt structure, and discusses why reasoning/thinking model variants are paradoxically more susceptible to prompt injection than non-thinking variants. The researcher responsibly disclosed the issue to Anthropic via HackerOne before publishing. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [HackedGPT: Novel AI Vulnerabilities Open the Door for Private Data Leakage](https://daily.dev/posts/hackedgpt-novel-ai-vulnerabilities-open-the-door-for-private-data-leakage-v1llnf112) · Security Boulevard · 0 upvotes · 0 comments --- Tags: [#claude](https://daily.dev/tags/claude), [#ai-security](https://daily.dev/tags/ai-security), [#prompt-injection](https://daily.dev/tags/prompt-injection) [View this post on daily.dev](https://daily.dev/posts/breaking-opus-4-7-with-chatgpt-hacking-claude-s-memory-embrace-the-red-i3pdz3zfb)