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CVE-2026-55528 – Authentication Bypass (Missing Authorization) – PraisonAI AgentServer < 4.6.58 / pr

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Summary

CVE-2026-55528 is a missing-authorization vulnerability in the AgentServer component of PraisonAI’s praisonaiagents package. Although the server exposes an auth_token configuration option and appears to mask it in status output, the token is never actually validated on any HTTP route, allowing a remote, unauthenticated attacker to access sensitive agent-orchestration functionality. The issue is rated High severity (CVSS 8.2) and affects PraisonAI versions prior to 4.6.58 and the praisonaiagents PyPI package prior to 1.6.58.

Technical details

  • Root cause: The AgentServer._create_app() method never reads the configured auth_token value and never attaches authentication/authorization middleware to the Flask/HTTP routes it registers, so the token setting has no functional effect.
  • Trigger conditions: Any deployment running an exposed AgentServer instance, including operators who believe they have secured the server by setting auth_token, since the configuration is silently ignored.
  • Attack vector: Network-based; no authentication, privileges, or user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact:
    • /info can be queried to leak server configuration details (the token is displayed masked, but access itself is unrestricted).
    • /publish allows an attacker to inject arbitrary events to all subscribed agents, enabling manipulation of agent behavior/workflow integrity.
    • /events can be subscribed to, allowing eavesdropping on the entire event bus (confidentiality exposure).
    • /health discloses live client/connection counts.
    • The CVSS vector reflects Low confidentiality impact and High integrity impact, consistent with the ability to inject events into agent workflows without authorization.

Affected software

  • PraisonAI: versions < 4.6.58
  • praisonaiagents (PyPI): versions < 1.6.58

Severity

  • CVSS v3.1 Base Score: 8.2 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
  • Weaknesses: CWE-306 (Missing Authentication for Critical Function), CWE-862 (Missing Authorization)

Mitigation and recommended actions

  • Immediate: Upgrade PraisonAI to version 4.6.58 or later, and/or the praisonaiagents package to version 1.6.58 or later, which contains the fix enforcing auth_token validation on all AgentServer routes.
  • If immediate patching is not possible:
    • Do not expose AgentServer instances directly to untrusted networks or the public internet; restrict access to trusted internal networks only.
    • Place the AgentServer behind a reverse proxy or API gateway that enforces authentication/authorization independently of the application’s own (non-functional) token check.
    • Use network-level controls (firewall rules, VPN, allow-listing) to limit which hosts can reach /info, /publish, /events, and /health endpoints.
    • Monitor logs for unexpected access to these endpoints or unusual event publication activity as an indicator of exploitation attempts.

References

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