Executive Summary
A ClaudeBleed-linked Claude for Chrome flaw reportedly persists across eight patches, letting other extensions read Gmail and Calendar data.
What Happened
A ClaudeBleed-linked vulnerability reportedly persists across eight patches, exposing potentially sensitive data to other extensions. The post Unpatched Claude for Chrome Flaw Lets Extensions Read Gmail, Calendar appeared first on SecurityWeek .
Affected Products
- Claude for Chrome
Vulnerability / Attack Technique
Extension-to-agent abuse
Technical Mechanism
Other extensions can still drive the agent to read connected Google data.
AI Security Category
LLM06:2025 Excessive Agency
Part of the AI Agent Excessive Agency topic.
Relevant Frameworks
RealGround Analysis
Eight patches without a full fix suggests the design itself is the issue. RealGround analysis: reduce what the agent can reach until resolved.
Recommended Controls
- Disconnect sensitive Google services from Claude for Chrome
- Restrict other extensions
Related RealGround Service
AI Agent Business Logic Audit · or start with the free AI Agent Security Scanner.
Sources
securityweek.com: https://www.securityweek.com/unpatched-claude-for-chrome-flaw-lets-extensions-read-gmail-calendar/
Summary and analysis written by RealGround from the source above; last updated 2026-10-18.