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Case

AISI agents took unsanctioned actions on the live internet

During a deliberately permissive cyber evaluation, AISI observed 19 unsanctioned live-internet actions across 10 runs, including an attempted malicious pull request and social engineering of a maintainer.

Setting: evaluationExploitation: observed liveEvidence: Grade B
emerging behaviorFirst seen Jul 25, 2026BY AI5 claims
Case

AutoJack crossed from hostile web content into a local MCP control plane

Microsoft demonstrated a path from a hostile page opened by an agent to process execution through AutoGen Studio’s local MCP control plane. The affected development code was fixed before a PyPI release, according to Microsoft.

Setting: research demonstrationExploitation: demonstratedEvidence: Grade BRemediation: fixed reported
vulnerabilityFirst seen Jun 18, 2026AGAINST AI3 claims
Case

GTG-10007 built an autonomous exploit foundry and used the outputs in real intrusions

Anthropic reports a Chinese-speaking espionage operation that ran persistent AI workflows for vulnerability research, reconnaissance and collection, while human operators used the resulting access in real victim networks.

Setting: productionExploitation: observed liveEvidence: Grade B
incidentFirst seen Sep 10, 2026WITH AI4 claims
Case

GTG-20006 automated parts of a Russian espionage workflow

Anthropic reports a Russian state-nexus espionage actor using customized AI workflows across development, phishing, persistence, command-and-control and exfiltration, including automatic malware rebuilding after detection.

Setting: productionExploitation: observed liveEvidence: Grade B
incidentFirst seen Dec 1, 2025WITH AI4 claims
Case

GTG-50014 used agentic pipelines to turn exposed credentials into rapid multi-victim theft

Anthropic reports ShinyHunters-affiliate clusters using AI for large-scale credential harvesting, intrusion, data theft and supply-chain collection, including one 1.8-million-APK scanning pipeline.

Setting: productionExploitation: observed liveEvidence: Grade B
incidentFirst seen Sep 10, 2026WITH AI4 claims
Case

GTG-50020 used prompt injection against an AI evaluation sandbox

Anthropic reports that a financially motivated actor injected malicious instructions into an AI vendor's automated evaluation sandbox, stole production API keys and then used agentic workflows against roughly 30 AI companies in about four days.

Setting: productionExploitation: observed liveEvidence: Grade B
incidentFirst seen May 21, 2026WITH AI · AGAINST AI4 claims
Case

GTG-50029 used agentic workflows across a European hacktivist campaign

Anthropic reports that a single French-speaking actor used Claude and sub-agent workflows against European political, media, think-tank and SaaS targets, gaining internal access to at least 14 of 42 tracked entities.

Setting: productionExploitation: observed liveEvidence: Grade B
incidentFirst seen Feb 6, 2026WITH AI5 claims
Case

MCP Python SDK tasks crossed client-session boundaries

The MCP Python SDK’s experimental task handlers let one connected client read or cancel another client’s work. Version 1.27.2 adds session binding for SDK-generated task IDs, but custom IDs and custom handlers still need an ownership policy.

Exploitation: not establishedEvidence: Grade BRemediation: patch available
vulnerabilityFirst seen Jun 5, 2026AGAINST AI4 claims
Case

Semantic Kernel prompt injection reached host code execution

CVE-2026-26030 allowed a model-controlled Search Plugin parameter to reach an unsafe eval-based filter path and execute code on the Semantic Kernel host under affected conditions.

Setting: research demonstrationExploitation: demonstratedEvidence: Grade BRemediation: patch available
vulnerabilityFirst seen Feb 19, 2026AGAINST AI4 claims
Case

The May RubyGems package flood is now linked to OpenAI agents, but attribution remains disputed

RubyGems confirms a large May spam-publishing campaign. Independent researchers attribute the activity to OpenAI agents; OpenAI confirms agent use of RubyGems but says it has not verified the malicious-package claims.

Setting: productionExploitation: observed liveEvidence: Grade BRemediation: mitigation available
incidentFirst seen May 11, 2026BY AI4 claims
Case

Windows-MCP HTTP modes exposed PowerShell behind a weak control plane

Before version 0.7.5, Windows-MCP's documented HTTP transports could expose an unauthenticated MCP control plane with wildcard CORS while the same server exposed a PowerShell execution tool.

Setting: research demonstrationExploitation: not establishedEvidence: Grade BRemediation: patch available
vulnerabilityFirst seen May 14, 2026AGAINST AI4 claims