Meta's Muse AI agent exposes private chats through guessable share links

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Meta's Muse AI agent exposes private chats through guessable share links

Claroc researchers listed 6,800 Muse share links through passive DNS records, because each link puts the conversation title in a subdomain under cf.metaaiusercontent.com, and a few hundred opened pages exposed private material.
Exposed pages included a loan application with the requested amount, a to-do list with a bank fraud alert, partial account number and transaction amount, and a workplace's full-year staff vacation calendar.
Meta paused the sharing feature while it reviews the report and considers changes to how share links can be discovered.
Claroc reported the flaw through Meta's bug bounty program on October 8 and says its LinkedIn attempts to reach Meta staff got no reply.
The disclosure follows a zero-day that Patrick Wardle found three weeks after Muse launched, which let any app on the same Mac take over a user's Muse account, and Meta downplayed it as requiring an already compromised device.

Hacker News opinions

Calling it careless misses the point. The whole business is targeted ads, so grabbing user data is the product.

Anyone still using Facebook stuff should know what they're signing up for. But most people won't feel the consequences until something forces clear warnings on them.

The lesson is simple: anything you don't want guessed should never go into a subdomain name, since passive DNS records keep those names searchable.

Muse feels doomed to me. Agent bots need to be walled off from personal info, and Meta walks in saying trust me. Not a great combo.

I don't get why they used DNS subdomains at all. Generate a random unique URL and reverse DNS lookups get a lot harder.

I still don't get why people rush to these agents. I run a local one with local models and DeepSeek, and it cuts the boring chores. I'd never put my stuff in Muse's cloud though.

We run a small AI assistant platform with 20 paying users, and they customize everything and run crons. The sandboxes get messy fast, so I'm not shocked Muse has problems at scale.

Shocking, yeah, but Zuck has basically infinite money, so you'd expect better.

I tried Muse with a fresh Meta identity and only poked at the free VM. No way I'm giving it anything sensitive.