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CVE-2026-72776 – Unauthenticated Remote Code Execution – AgenticSeek ≤ 2.41.1

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Summary

CVE-2026-72776 is a critical unauthenticated remote code execution (RCE) vulnerability in AgenticSeek, an open-source autonomous AI agent platform, caused by an unprotected API endpoint combined with unsafe shell command execution. Any attacker with network access to the exposed service can submit a crafted request and achieve full host-level command execution without any credentials. The flaw is tracked as CWE-306 (Missing Authentication for Critical Function) and carries a critical severity rating.

Technical details

  • Root cause: The AgenticSeek backend exposes a POST /query API endpoint with no authentication or access control, bound to 0.0.0.0:7777 and configured with wildcard CORS, making it reachable from any origin on the network.
  • Trigger conditions: A request to /query causes the agent to generate and execute shell commands via its BashInterpreter tool, which invokes subprocess.Popen with shell=True; command filtering relies on an incomplete blocklist that can be bypassed.
  • Attack vector: Network (unauthenticated, no user interaction required) — an attacker simply sends a crafted query to the exposed endpoint.
  • Impact: Full compromise of confidentiality, integrity, and availability of the host running AgenticSeek, as arbitrary OS commands can be executed with the privileges of the service.

Affected software

  • Fosowl/agenticSeek — all commits up to and including fc242c7 (prior to fix commit f1eb2cfc721f8a21dd16a8b048a9ca89f3259f6f)

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0 Base Score: 9.3 (Critical) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Update to a version of AgenticSeek including commit f1eb2cfc721f8a21dd16a8b048a9ca89f3259f6f (merged via PR #534) or later, which addresses the authentication and command-execution issues.
  • If no patch can be applied immediately:
    • Do not bind the AgenticSeek API to 0.0.0.0; restrict it to localhost or an internal-only interface.
    • Place the service behind a reverse proxy or gateway that enforces authentication before requests reach /query.
    • Remove or restrict the wildcard CORS configuration to trusted origins only.
    • Use network-level controls (firewall rules, VPN/segmentation) to block internet exposure of port 7777 and any AgenticSeek management interfaces.

References

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