Chrome Web StoreCaution required
Suspicious in code review (v1.0.93)
Our reviewer found behaviour consistent with malware in version 1.0.93, but not enough to confirm it. Treat this extension as untrusted until it has been re-reviewed.
What our analysis found
Claude, used by 21,000,000 people, is rated caution by Extension Auditor. Our code review reported 1 finding (1 high), led by other. It comes from a trusted publisher and was last updated in November 2026.
Key findings
- High
Other
The bundled manifest declares nativeMessaging, unlimitedStorage, downloads, and identity as required permissions, and it omits system.display. The live CWS published manifest lists nativeMessaging only as an optional permission, omits, and includes system.display. This means the reviewed ZIP does not match the currently published extension, so those high-impact permission changes may not be visible in the store listing.
Analyst notes
The code is an official Anthropic browser-automation extension and is largely consistent with its stated function: side-panel Claude, tab management, CDP automation, a WebSocket bridge to [domain withheld], and disclosed telemetry. ML risk is 0.00, the permhash cluster is clean, and the publisher is Google-trusted. However, the bundled manifest diverges from the live CWS manifest for high-impact permissions, so the package does not match the currently published listing and cannot be fully cleared without publisher verification.
Claude Chrome extension security report
ID: fcoeoabgfenejglbffodgkkbkcdhcgfn
Supported Languages
Extension Info & Metadata
Publisher Contextual Analysis
- Author
- https://claude.com
- Privacy
- Privacy Policy
- Help
- Help Center
- Country
- US
- MX records exist
- Yes
- Domain exists
- Yes
- Is disposable
- No
- Is role-based
- No
- Mailbox exists
- Yes
- Address
- 548 Market St PMB 90375 San Francisco, CA 94104-5401 US
- Website
- Visit
Screenshots & videos
Install growth
No Security Analysis Available
Security analysis has not been performed for this extension version yet.
About this extension
Claude in Chrome
Read the publisher’s full description
Claude works directly in your browser and takes actions on your behalf. Currently limited to 1,000 Max plan subscribers during our initial research phase. TWO REQUIREMENTS TO USE THIS EXTENSION: Step 1: Max plan required. You need an active Max plan subscription to join our research preview waitlist at claude.ai/chrome. Step 2: Wait for access notification. After joining the waitlist, we'll email you when it's your turn. Only install after receiving this email. Installing without both requirements will block your sign-in. CLAUDE IN YOUR BROWSER Chat with Claude in the sidebar while browsing any website. Ask Claude to read pages, click buttons, or handle repetitive tasks—all through natural conversation. Browser use is a beta feature with unique risks. These risks are heightened when interacting with the internet. Take precautions. Read more here: https://clau.de/getting-started-with-claude-for-chrome BUILT FOR REAL WORKFLOWS • Navigating and organizing your inbox and calendar • Form filling and repetitive data entry • Extracting information from web content • Navigating complex multi-step processes YOU'RE IN CONTROL Set permissions for each website. Claude will ask before taking certain irreversible or potentially harmful actions, like making a purchase. Be careful when bypassing permissions. RESEARCH PREVIEW MEANS: • This is experimental technology with known limitations • Designed for AI-experienced users who can provide feedback • Will not work perfectly or risk-free on all websites or tasks • Helps shape the future of Claude in the browser through your usage GETTING STARTED 1. Join waitlist at claude.ai/chrome (Max plan required) 2. Install extension once approved 3. Sign in with Max credentials 4. Open sidebar and describe your task 5. Grant site permissions when prompted IMPORTANT: BROWSER USE FACES PROMPT INJECTION RISKS Malicious websites can hide instructions that trick AI into harmful actions - like deleting files or sharing banking information. Our testing found these attacks can succeed even with safeguards. HOW TO USE IT SAFELY: 1. Start with trusted sites: Grant permissions to familiar websites first while learning how Claude works 2. Review before sensitive actions: Always confirm before Claude handles financial, personal, or work-critical tasks 3. Watch for malicious instructions: Be cautious if Claude suddenly behaves unexpectedly or ignores your commands - some websites contain hidden instructions that can override yours 4. Report issues immediately: Help us improve by flagging any concerning behavior through the feedback options Full safety guide: https://clau.de/getting-started-with-claude-for-chrome Important: This research preview carries unique risks. Claude may occasionally misinterpret instructions or website layouts. Always review actions before confirming, especially for sensitive tasks. Terms of Service: https://www.anthropic.com/legal/consumer-terms Privacy Policy: https://www.anthropic.com/legal/privacy
User reviews
Extension files
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No network indicators were extracted from this version.
Code Diff
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