Junglewise Threat Intelligence

CVE-2026-17530: AstrBotDevs AstrBot incorrect authorization in Subagent tool handoff

CVE-2026-17530 · Severity: medium · CVSS 6.3 · Published 2026-07-27

Technologies: AstrBotDevs Astrbot.

Executive brief

AstrBot is an AI agent development framework that integrates with various chat platforms and large language models. A security flaw in the subagent component allows low-privileged users to bypass permission checks and access administrative tools. This could allow an unauthorized user to execute restricted commands or access sensitive data by manipulating how the AI agent hands off tasks between different tools.

Technical details

An incorrect authorization vulnerability exists in AstrBot up to 4.25.5 within the `_build_handoff_toolset` function of `AstrBot/astrbot/core/astr_agent_tool_exec.py`. The root cause is that the subagent handoff path rebuilds its toolset from the raw `llm_tools.func_list` instead of adhering to established permission boundaries. A remote attacker with low-privileged chat access can trigger a subagent with a null tools value to reach admin-restricted Model Context Protocol (MCP) tools. This bypasses intended access controls for non-builtin tools. A patch has been released in commit d23011262e8e75e1ec41b0f1f0091493a022327e to enforce persona tool boundaries.

Affected products

  • AstrBotDevs AstrBot up to 4.25.5

Timeline

  • 2026-06-15: patched: Fix commit d23011262e8e75e1ec41b0f1f0091493a022327e authored.
  • 2026-07-27: advisory: CVE-2026-17530 published.

References