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LLM security testing: how to pentest LLMs and MCP servers

Escape.tech publishes a methodology for pentesting LLM applications and MCP servers, mapping attacks to the OWASP Top 10 for LLM Applications 2025 (prompt injection, improper output handling, excessive agency, system-prompt leakage) and demonstrating them against a self-built vulnerable FastMCP lab. The guide explains why LLM testing breaks the web-app playbook — no parser boundary, non-deterministic interpreter, no sanitization line — and notes MCP tool descriptions and tool responses both reach the model as trusted injection channels, referencing tool poisoning and rug-pull attacks. Details →

Prompt Injection: How to Protect AI Agents and LLM Apps

An educational guide, "Prompt Injection: How to Protect AI Agents and LLM Apps," explains the instruction-vs-data trust problem underlying direct and indirect prompt injection and lays out a layered defense model (least privilege, tool access controls, approvals for consequential actions, structured tool arguments, validation, sandboxing, monitoring, and adversarial evals). The piece synthesizes framing from OWASP LLM Top 10 (LLM01), OpenAI, and Anthropic, using examples such as malicious instructions hidden in emails, webpages, RAG chunks, and MCP resources. Details →

Prompt Injection Hacking: Emerging Trade Secret, Employment, and Litigation Risks

An article from Search Engine Land explains how prompt injection has evolved to threaten brands and AI workflows, citing examples such as Permiso's 'ChatGPhish' where malicious payloads embedded in ordinary webpages coerce AI assistants (ChatGPT, Perplexity) into rendering spoofed account alerts and malicious QR codes inside the chat interface, bypassing URL blocklists. It surveys additional vectors including LLM referral hijacking via semantic embedding, weaponized multimodal inputs (podcasts, video, voice agents), rogue AI customer-support agents, and supply-chain risk from unvetted AI vendors. Details →

CyberTalks: Data Poisoning Attacks on ML & Agentic AI Systems | Jason Ross |COASP - YouTube

An explainer on AI data poisoning describes how attackers corrupt the data a model learns from, fine-tunes on, or retrieves — including training data, alignment data, and RAG knowledge bases — so a poisoned model behaves as the attacker intends while passing ordinary validation. It distinguishes data poisoning from prompt injection, jailbreaking, evasion, and model poisoning, and notes research (e.g. Carlini et al.'s web-scale poisoning work) showing under 1% poisoned data can measurably change behavior, recommending provenance, access control, monitoring, and rollback as layered defenses. Details →

RAG Security Guide: Prevent Enterprise AI Data Leakage

The bdemerson.com guide "RAG Security: Where Retrieval Pipelines Fail" walks through five failure classes in retrieval-augmented generation deployments: poisoned corpora, indirect prompt injection carried in retrieved documents, permission leakage across the index, embedding inversion that reconstructs text from stored vectors, and weak tenant isolation in vector stores. It frames the retrieval pipeline (ingestion, embedding, storage, retrieval, generation) as the real attack surface and offers defensive evaluation habits, referencing research such as the arXiv paper "Pirates of the RAG" on black-box knowledge-base leakage. Details →

OWASP Top 10 LLM & Gen AI Vulnerabilities in 2026

Bright Defense publishes an explainer walking through the OWASP Top 10 LLM and generative-AI vulnerabilities (prompt injection, sensitive information disclosure, supply chain risks, data/model poisoning, improper output handling, excessive agency, system prompt leakage, vector/embedding weaknesses, misinformation, and unbounded resource consumption), giving each category a description, sample attack scenario, and mitigation guidance. The piece is reference material synthesizing the OWASP framework rather than reporting a specific incident or presenting new findings. Details →
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