First reported embracethered.com
Lead dispatch
First reported island.io
AgentBaiting: How Fake AI Skills Deliver Malware at Scale
Island security researchers uncovered the FakeGit campaign, which used roughly 7,600 malicious GitHub repositories—over 800 posing as AI Skills or MCP servers—to deliver SmartLoader malware that installs the StealC information stealer. The campaign introduces a technique called AgentBaiting, in which AI agents such as Claude Code, Gemini, and ChatGPT autonomously discover the attacker repositories, treat the malicious README as legitimate documentation, and pass installation instructions to users; the operation recorded over 14 million downloads.supply-chain · tool-abuse · malware-delivery · agentbaiting
mcp · ai-agents · ai-skills · llm · copilot
Severity
0.75
The wire · latest
First reported mitiga.io
Modern Malware — Spyware Skills, Hijacked Base URLs, and 1,230+ Leaking API Keys in AI Instruction Files
Mitiga Labs details malware hidden in AI agent instruction files — Cursor rules, Anthropic Skills, Claude Hooks, AGENTS.md/CLAUDE.md context files, MCP server configs, and .pyc droppers — that AI agents follow with near-zero validation. The research found prompt-exfiltration tradecraft caught in the wild, attacker-controlled ANTHROPIC_BASE_URL overrides routing Claude traffic through MITM proxies, permission-bypass defaults, and over 1,230 hardcoded API keys and JWT tokens across tens of services. Mitiga also released a free scanner, Skillgate, built during the investigation. Details →First reported · updated · 5 reports wiz.io
GhostApproval: AI Coding Assistant Trust Boundary Flaw
Wiz researchers disclosed GhostApproval (CVE-2026-12958 and related), a symlink-following vulnerability pattern (CWE-61 plus CWE-451 UI misrepresentation) affecting six top AI coding assistants: Amazon Q Developer, Anthropic Claude Code, Augment, Cursor, Google Antigravity, and Windsurf. A malicious repository disguises a symlink as an innocuous config file so that when the agent 'sets up the workspace' it writes an attacker SSH key to ~/.ssh/authorized_keys — sometimes before any confirmation dialog — while the human-in-the-loop approval prompt conceals the true target, enabling remote code execution. AWS, Cursor, and Google fixed the issue; two vendors went silent and one called it outside its threat model. Details →First reported · updated · 3 reports appsentinels.ai
One Poisoned MCP Server Can Hijack All the Others — Coograph
MCP tool poisoning hides malicious instructions inside a Model Context Protocol server's tool descriptions, parameter schemas, or return values — invisible to human reviewers but fully read by the LLM, which then selects and executes the poisoned tool, enabling data exfiltration, credential theft, or lateral movement. The technique spans schema poisoning, tool shadowing, and rug pulls, and is catalogued as OWASP MCP03:2025; a single malicious server can influence an agent's decisions across all connected tools (cross-tool poisoning). Details →First reported swarmnetics.com
Agentjacking and MCP trust: are AI coding agents too easy to steer?
Agentjacking, described by Swarmnetics and Tenet Security, abuses trusted error-report inputs in AI coding agents: an attacker with a publicly exposed Sentry DSN can inject malicious instructions into telemetry that the agent processes, steering it to exfiltrate secrets such as cloud keys, Git credentials, and private repo URLs. The root flaw is that these systems treat source trust as if it equals action trust, letting external report text become executable guidance. Details →First reported tenetsecurity.ai
A public Sentry key is all it takes to hijack Claude Code, Cursor, and Codex
Researchers at Tenet Security describe "agentjacking," an attack in which a publicly exposed Sentry key lets an attacker inject fake error messages that AI coding agents such as Claude Code, Cursor, and Codex ingest via the Sentry MCP server. The crafted error content acts as an indirect prompt injection, hijacking the agent to execute attacker-directed actions; the team also published a mitigation tool, agent-jackstop, on GitHub. Details →First reported qianxin.com
NadMesh Botnet Analysis: A Product-Grade Threat for the AI Service Era
NadMesh is a Go-based botnet observed in early July 2026 by QiAnXin's XLab that autonomously scans for and exploits exposed AI services — ComfyUI, Ollama, n8n, Open WebUI, Langflow, and Gradio — using a Shodan harvester (ai_harvest.py) to prioritize AI infrastructure and the MCP ecosystem. It folds scanning, 20+ RCE exploitation vectors (Redis, Docker, MCP, Kubernetes), credential/AI-service intelligence harvesting, polymorphic builds, and redundant persistence into a single productized platform; the operator's dashboard claims 3,811 unique AWS keys plus model inventories tagged as cloud services. Details →First reported strobes.co
CVE-2026-23744 - CVE Details, Severity, and Analysis | Strobes VI
CVE-2026-23744 is a critical (CVSS 9.8) remote code execution vulnerability in MCPJam Inspector versions 1.4.2 and earlier, a local-first development platform for MCP servers. Because the tool binds to 0.0.0.0 and its /api/mcp/connect endpoint extracts command and args without security checks, an attacker can send a crafted, unauthenticated HTTP request to trigger arbitrary command execution with no user interaction; public PoCs and vendor patches are available. Details →First reported · updated · 2 reports redhat.com
CVE-2026-42271 - Red Hat Customer Portal
CVE-2026-42271 is an Important-severity (CVSS 8.8) flaw in LiteLLM, an AI gateway/proxy for LLM APIs, where two MCP-server preview endpoints accepted full server configurations including command-execution parameters without adequate role checks. An authenticated user with even low-privilege internal-user keys could send a crafted configuration to achieve arbitrary OS command execution on the proxy host; Red Hat notes known public exploits and the CVE is tracked in CISA's KEV catalog, with fixes shipped in LiteLLM v1.83.7-stable and Red Hat OpenShift AI / Ansible Automation Platform errata. Details →First reported · updated · 3 reports theregister.com
Red teamers turned Claude Desktop into a double agent to do their evil bidding
Oasis Security disclosed "PromptFiction," a vulnerability in Anthropic's Claude Desktop where a single click on a trusted-looking claude:// URL silently submitted attacker-controlled prompts to the assistant with no user confirmation. Chained with the earlier "Claudy Day" trio of flaws, it could enable silent exfiltration of prior conversations and — when Anthropic's official Filesystem MCP server is installed — file read/write, persistence, and remote code execution. Anthropic has fixed the flaw. Details →First reported mitiga.io
MCP Token Theft in Claude Code: A Man-in-the-Middle Attack Chain
Mitiga Labs research details a man-in-the-middle attack chain against Claude Code in which a user-level post-install hook rewrites MCP server endpoints in ~/.claude.json to route MCP traffic through attacker-controlled infrastructure and steal OAuth tokens for connected SaaS (Jira, Confluence, GitHub, etc.). Because provider-side audit logs still show valid OAuth traffic from Anthropic's trusted egress range, the malicious activity blends in as legitimate user actions, and token rotation fails to break the chain while the hook keeps reseeding the config. Details →First reported · updated · 2 reports adversa.ai
The Cursor deeplink vulnerability that turns a “review this PR” click into remote code execution
Adversa AI researcher Rony Utevsky details a Cursor IDE vulnerability (dubbed DeepJack) where a crafted `cursor://` deeplink installs an attacker-controlled MCP server that runs arbitrary, unsandboxed commands under the victim's account after one click and one confirmation. The install dialog renders the command in a single-line field so a malicious tail is pushed off-screen, and double-URL encoding disguises the `mcp/install` URI as a routine `pr-review` link. Cursor acknowledged the root cause but closed the reports as duplicates, and build 3.9.8 reportedly remains vulnerable. Details →First reported sans.edu
Someone Is Scanning for Your MCP Servers and AI Assistant Credentials
A SANS ISC diary by Manuel Humberto Santander Peláez reports that analysis of 14 days of Apache/ModSecurity logs from a small web host revealed distributed internet scanning specifically targeting Model Context Protocol (MCP) servers, AI assistant configuration files, and locally exposed LLM endpoints. Notably, the POST /mcp probes carried valid JSON-RPC 2.0 MCP 'initialize' handshakes from 49 distinct source IPs, indicating scanners that speak the protocol and would enumerate tools and data sources if a real MCP server responded. Details →First reported jscrambler.com
Unauthorized Publication of a Malicious npm Package affecting CI
Jscrambler disclosed that a threat actor used compromised npm publishing credentials to publish a malicious version of its 'jscrambler' npm package (versions 8.14, 8.16, 8.17, 8.20), which ran an infostealer during the preinstall hook and was downloaded around 1,479 times in a two-hour window. Per Socket's analysis, the malware harvested developer credentials, cloud secrets, crypto wallets, browser data, and notably AI coding tool and MCP configurations (Claude, Cursor, Windsurf, VS Code, Zed), using ChaCha20-Poly1305 obfuscation to resist analysis. Jscrambler revoked credentials and released a safe version 8.22. Details →First reported simonwillison.net
Microsoft Warns Poisoned MCP Tool Descriptions Can Make AI Agents Leak Data
Microsoft research describes how attackers can poison MCP tool descriptions to hijack AI agents into quietly exfiltrating company data to an outsider, without the agent visibly breaking any rule so default setups raise no alarm. Details →First reported wiz.io
Amazon Q VS Extension Flaw Leads to Cloud Credential Theft
A vulnerability in the Amazon Q Visual Studio extension could let adversaries plant a malicious repository that executes arbitrary code and steals cloud credentials, highlighting growing MCP-related risk. Details →First reported thehackernews.com
Amazon Q Developer Flaw Could Let Malicious Repos Run Code via MCP Configs
A high-severity flaw (CVE-2026-12957, CVSS 8.5) in Amazon Q Developer's handling of Model Context Protocol (MCP) servers allowed a malicious repository to run commands and steal a developer's cloud credentials once the workspace was trusted. Amazon has patched the bug. Details →First reported microsoft.com
AutoJack: How a single page can RCE the host running your AI agent | Microsoft Security Blog
Microsoft researchers disclosed AutoJack, an exploit chain in AutoGen Studio where untrusted web content rendered by a browsing agent can reach a local MCP WebSocket and spawn arbitrary processes on the host, crossing the localhost trust boundary to achieve RCE. The issue was reported to MSRC and hardened upstream in commit b047730; the vulnerable MCP WebSocket surface was never shipped in a PyPI release. Details →First reported arstechnica.com
Millions of AI agents imperiled by critical vulnerability in open source package
A critical authentication-bypass vulnerability (CVE-2026-48710, dubbed BadHost) in the Starlette framework lets a single character injected into the HTTP Host header bypass path-based authorization. Because Starlette underpins FastAPI, vLLM, LiteLLM, and many MCP servers and agent harnesses, the flaw exposes millions of AI agents and their stored third-party credentials and sensitive data to trivial exploitation. Details →How the wire is made
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