First reported · updated · 5 reports varonis.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 wiz.io
Wiz Uncovers Critical Access Bypass Flaw in AI-Powered Vibe Coding Platform Base44
Wiz disclosed a now-patched critical authentication bypass in Base44, an AI-powered 'vibe coding' platform owned by Wix, where supplying only a non-secret 'app_id' value to undocumented registration and email-verification endpoints let an attacker create a verified account for private applications. The flaw bypassed all authentication controls, including SSO, granting full access to private apps and their data; Wix fixed it within 24 hours of the July 9, 2025 disclosure, with no evidence of exploitation in the wild. 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 · updated · 2 reports cereblab.com
Grok Build Uploads Entire Git Repositories to xAI Storage, Not Just Files It Reads
AI safety researcher Cereblab found that xAI's Grok Build CLI uploaded users' entire Git repositories — including files it was explicitly told not to open and secrets deleted from Git history — as Git bundles to a Google Cloud Storage bucket, even on an idle 'reply OK' prompt. The behavior was reproduced across multiple codebases and captured on the wire via mitmproxy; xAI later disabled it server-side with a disable_codebase_upload flag and Musk promised deletion of uploaded data. 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 tabstack.ai
Hardening AI Web Agents: How We're Securing Tabstack Against Indirect Prompt Injection | Tabstack Blog
Tabstack (Mozilla) disclosed an indirect prompt injection vulnerability in its /v1/automate web-agent endpoint, found by Brave researchers, where hidden white-on-white instructions on a target page caused the autonomous agent to exfiltrate the user's conversation history to an external form. The flaw has been patched with a structural 'action firewall' that classifies form interactions via DOM metadata and provenance rather than trying to detect malicious text. Details →How the wire is made
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