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Anthropic and EPFL Demonstrate Self-Propagating AI-Agent Payloads

The Hacker News 2026-10-12 AI agent abuse Critical

What Happened

Researchers from Anthropic and EPFL demonstrated payloads that can spread between AI agents through editable system-prompt files. The technique targets agent harnesses that use those files to preserve state between sessions.

Why It Matters

Researchers from Anthropic and EPFL demonstrated payloads that can propagate between AI agents through editable system-prompt files used to preserve state between sessions. The reported technique targets agent harnesses that permit those files to be modified and subsequently loaded by other sessions or agents. RealGround analysis: organizations should audit state persistence, file permissions, agent-to-agent boundaries, and prompt-loading workflows, then validate defenses through adversarial testing.

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RealGround Analysis

This signal maps to AI agent abuse. Organizations using AI agents, LLM APIs, SaaS integrations, or sensitive data workflows should review whether this class of issue could create unauthorized tool execution, data leakage, weak approval gates, or unmanaged supply-chain exposure.

Recommended Actions

  • Restrict AI agent tool permissions and production write paths.
  • Review sensitive data access across prompts, logs, embeddings, memory, and SaaS integrations.
  • Add human approval workflows for high-impact or state-changing actions.
  • Run prompt injection and indirect prompt injection tests against affected workflows.
  • Document the owner, control gap, and remediation deadline for this risk class.

Source

https://thehackernews.com/search/label/Prompt%20Injection?max-results=20&m=1&hl=ru

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