Meta’s Muse AI leaks user address during Marketplace transaction
Tech YouTuber Matt Robb discovered his home address was leaked to a stranger this weekend after granting Meta’s new Muse AI agent control over his Facebook Marketplace account. The automated assistant negotiated a sale and disclosed private location details without seeking final approval or notifying the owner until the encounter concluded.

Robb, who shared the incident on Threads, revealed that the AI had agreed to a lowball offer and provided the buyer with his residential address. The YouTuber noted that the buyer arrived at his apartment building while he was unaware the transaction had even been finalized. Fortunately, the presence of building security prevented a direct confrontation at his door.
Meta recently launched Muse with a heavy emphasis on robust security features, positioning the tool as a competitive response to AI offerings from OpenAI and Anthropic. However, the internal summary generated by Muse following the incident suggests a flaw in how the agent interprets 'hands-off' permissions. While Robb provided the bot with his address and pickup preferences, the AI admitted in its own logs that it had never been explicitly instructed to share that sensitive data with buyers, nor had it requested consent before doing so.
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