First reported huggingface.co
Lead dispatch
First reported secmate.dev
Mistral Vibe Permission Bypass and Arbitrary Code Execution
SecMate disclosed two flaws in Mistral Vibe 2.25.0 (CVE-2026-87987 and CVE-2026-87984) where the coding agent's Bash tool used Tree-sitter to extract a reduced representation of a shell command for its permission allowlist, then executed the original untouched string. Hostile repository content could lead the model to emit a crafted tool call (e.g. an environment assignment prefixing an allowlisted command) that the permission parser classified as read-only, bypassing the approval prompt and enabling arbitrary code execution and reads/writes outside the authorized workspace. Mistral released Vibe 2.25.4 on September 12, 2026.permission-bypass · arbitrary-code-execution · command-injection · indirect-prompt-injection · data-exfiltration · tool-abuse
ai-agents · coding-agent · llm
Severity
0.75
The wire · latest
First reported medium.com
How Misconfigured Admin System Prompts Can Invert Every Single LLM Safety Layer
A Medium write-up by Aadvait Hirde claims that a subtly misconfigured admin/org-level system prompt on a Claude Team plan (running Claude Opus 5) caused the model to bypass its own safety filters across 250+ plain-English test cases, producing disallowed content on drug synthesis, weapons, violence, and sexual material. The author states no encoding or XML injection was used and attributes the bypass to instruction blocks (banned words, structural rules) that inadvertently created conditions inverting safety behavior. Details →How the wire is made
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