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Mozilla Patches 423 Firefox 0-Day Vulnerabilities with Claude Mythos and Other AI Models

📅 8 May 2026 at 08:08 UTC📰 Cyber Security NewsView original source ↗
Mozilla Patches 423 Firefox 0-Day Vulnerabilities with Claude Mythos and Other AI Models

Mozilla has fixed a total of 423 Firefox security bugs in April 2026 alone, a figure nearly 20 times higher than its monthly average of about 21 bugs throughout 2025, driven by a groundbreaking agentic AI pipeline built around Anthropic’s Claude Mythos Preview and other large language models. The surge was triggered by Mozilla’s early […] The post Mozilla Patches 423 Firefox 0-Day Vulnerabilities with Claude Mythos and Other AI Models appeared first on Cyber Security News.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

Mozilla patched 423 Firefox vulnerabilities in April 2026, driven by an agentic AI pipeline built around Anthropic's Claude Mythos Preview and other large language models, resulting in a surge of security bugs nearly 20 times higher than its monthly average.

⚙️Technical Details
Affected Systems
Firefox
Attack Vectors
agentic AI pipeline
💥Impact Assessment
Severity: critical
🛡️Recommended Actions
1Apply the latest Firefox patch to prevent exploitation of newly discovered vulnerabilities.
2Monitor system logs for suspicious activity related to Firefox usage.
3Disable JavaScript in Firefox until further notice.
📦Affected Products
Firefox

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