Disclosed vulnerability
ClaudeBleed reopened: any extension can dispatch a synthetic click to make Claude for Chrome run tasks against Gmail, Drive and Salesforce
AIR-2026-0208 AIR record · 2026-08-anthropic-claudebleed-reopened
From the supporting source
Any script with DOM access on claude.ai can construct the button, set the task ID, and dispatch a synthetic click.manifold.security
The record
Disclosed
2026-08-28
Vendor
Anthropic
Product
Claude for Chrome
Risk domain
Privacy › Data exfiltration channels
Also touches
Unsafe actuation, Confused deputy
System type
Generative model
Who acted
Agent acted — a synthetic click makes the agent run tasks against Gmail, Drive and Salesforce
Attack surface
Browser agent
Autonomy level
Semi-autonomous
Initial vector
Synthetic dom event from a co resident extension
Impact type
Data exfiltration, Unauthorized actions
Confidence
High
Submitted by
EAI Internal
Crosswalk
- OWASP Agentic Top 10 (2026)
- ASI02 – Tool Misuse and Exploitation
- MITRE ATLAS
- AML.T0024 – Exfiltration via AI Inference API
- NIST AI RMF
- MAP 4.2
- EU AI Act
- Article 10
- ISO/IEC
- TR 24028; 23894
- AIUC-1
- A. Data & Privacy
- Scope
- tool misuse
- Mitigation
- Monitor network traffic for anomalous patterns; Restrict egress destinations.
- Taxonomy
- Enkrypt AI agent risk taxonomy · Black-Box Red Teaming of Agentic AI: A Taxonomy-Driven Framework for Automated Risk Discovery
Blast radius
Claude for Chrome users with any other extension that has content-script access to claude.ai
Capability abused
Defense & remediation
Recorded defense
user click required to launch a task (not verified as a trusted event)
Guardrail kinds
Unknown
Guardrail outcome
Silent
Fix shipped
none as of disclosure - Anthropic closed the reports and marked the tracking issue Resolved; the handler in v1.0.80 is byte-identical to v1.0.72
Taxonomy & references
Curator notes
Manifold Security. Follow-up to their earlier 'ClaudeBleed' disclosure, which Anthropic had announced fixed. The click handler never checks event.isTrusted, so a co-resident extension fabricates the click and Claude executes a chosen task ID with the user's live sessions - demonstrated reading Gmail and Google Docs comments, creating Calendar meetings, and modifying Salesforce leads. Researchers note the fix is one line. DISPUTE: vendor considers it resolved; researchers say it is not.
Supporting sources
Cite as
Enkrypt AI. "ClaudeBleed reopened: any extension can dispatch a synthetic click to make Claude for Chrome run tasks against Gmail, Drive and Salesforce". AIR, AIR-2026-0208. https://agentincident.vercel.app/i/AIR-2026-0208/ (accessed 2026-10-19).