Muse, Meta's extraordinarily privileged AI assistant, has a serious 0-day
SWEET MUSE Muse, Meta’s extraordinarily privileged AI assistant, has a serious 0-dayvar abtest_2172986 = new ABTest(2172986, 'click'); A simple ClickFix attack is only one way to completely hijack the new agent. Further raising questions, Amazon on Sunday began blocking Muse from its site. When a task requires a tool that doesn’t exist, Muse creates one on the fly.
- ▪SWEET MUSE Muse, Meta’s extraordinarily privileged AI assistant, has a serious 0-dayvar abtest_2172986 = new ABTest(2172986, 'click'); A simple ClickFix attack is only one way to completely hijack the new agent.
- ▪Further raising questions, Amazon on Sunday began blocking Muse from its site.
- ▪When a task requires a tool that doesn’t exist, Muse creates one on the fly.
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| Original publisher | Ars Technica |
| Canonical URL | https://arstechnica.com/security/2026/09/muse-metas-extraordinarily-privileged-ai-assistant-has-a-serious-0-day/ |
| Publication time | Mon, 21 Sep 2026 22:24:38 +0000 |
| Retrieval time | 2026-09-21T22:33:49.690Z |
| Last seen | 2026-09-21T22:33:49.690Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
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| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
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| Cluster | EcHmeQcMEPPq · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
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| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
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| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
SWEET MUSE Muse, Meta’s extraordinarily privileged AI assistant, has a serious 0-dayvar abtest_2172986 = new ABTest(2172986, 'click'); A simple ClickFix attack is only one way to completely hijack the new agent. Dan Goodin – Sep 21, 2026 6:24 pm | 0 Credit: Getty Images Credit: Getty Images Text settings Story text Size Small Standard Large Width * Standard Wide Links Standard Orange * Subscribers only Learn more Minimize to nav Meta founder and CEO Mark Zuckerberg has gone to great lengths to hype the security of its new AI assistant Muse, claiming it is “built from the ground up for privacy and security.” A zero-day vulnerability that gives locally run apps and terminal commands complete control of the agent raises serious doubts.
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