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ATR-2026-00149criticalSkill Compromiseexperimental

Skill Data Exfiltration via Compound Patterns

Detects compound exfiltration patterns in SKILL.md files where sensitive data (credentials, SSH keys, wallet files, browser data, environment variables) is read AND transmitted to an external endpoint. Single-action patterns (just reading env vars or just mentioning curl) are intentionally excluded to avoid false positives on legitimate security and DevOps skills.

Severity
critical
Category
Skill Compromise
Scan Target
skill
Author
ATR Community

Response Actions

block toolalertquarantine session

References

OWASP Agentic
ASI04:2026 - Supply Chain CompromiseASI05:2026 - Unexpected Code Execution
OWASP LLM
LLM06:2025 - Excessive Agency