First reported securing.ai
Lead dispatch
First reported · updated · 3 reports embracethered.com
AWS Kiro: Arbitrary Code Execution via Indirect Prompt Injection
Researchers found a vulnerability (CVE-2026-10591) in AWS Kiro, an agentic IDE, where hidden instructions planted in a web page or source file that Kiro processes can trigger indirect prompt injection to rewrite Kiro's own MCP server configuration (~/.kiro/settings/mcp.json) or allowlist arbitrary Bash commands in .vscode/settings.json, achieving arbitrary code execution on the developer's machine with no approval prompt. The human-in-the-loop approval boundary is bypassed because Kiro can write to these config files without user consent, and AWS has issued a fix and CVE.indirect-prompt-injection · prompt-injection · remote-code-execution · tool-abuse · config-poisoning
ai-agents · mcp · llm · agentic-ide
Severity
0.85
The wire · latest
First reported github.com
GitHub - marcsnid/steganeur: Hide secret messages inside LLM-generated text. Neural linguistic steganography in Rust with multiple methods.
steganeur is a Rust tool that hides secret messages inside LLM-generated text using neural linguistic steganography with multiple methods. Published as an installable Cargo crate, it encodes hidden data into natural-looking model output, creating a covert channel that rides on LLM text generation. Details →First reported itmeetsot.eu
Prompt Injection Experiments with Opus-5 in Claude Code - Auto-Mode Edition
An experiment tested indirect prompt injection against Opus-5 in Claude Code's new auto-mode, where a Sonnet-5 safety classifier is meant to block unsafe tool calls. Using a steganographic payload hidden in a README.jpg image, the agent was induced to download and execute untrusted remote code starting from a simple /init command; in 6 of 10 trials the agent ran the untrusted code and the classifier allowed it. Details →First reported veganmosfet.codeberg.page
From /init to Code Execution with Opus-5 in Claude Code - An Indirect Prompt Injection Story - IT meets OT
A security researcher demonstrates an indirect prompt injection against Claude Code running Opus-5 in YOLO mode (--dangerously-skip-permissions), where a single /init on a repo containing only a steganography-laden README.jpg leads the agent to decode hidden instructions (Morse/Vigenere), follow a chained WebFetch challenge, and ultimately download and execute untrusted remote code. Across 7 identical runs the model executed remote code in 6, with logs and the steganography encoding tool provided as attachments. Details →How the wire is made
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