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CVE-2026-57147 – Authentication Bypass via Hardcoded JWT Secret – PraisonAI Platform ≤ 0.1.4

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Summary

CVE-2026-57147 is a critical authentication bypass vulnerability in the praisonai-platform package (the backend platform component of the PraisonAI multi-agent framework). The platform’s authentication service ships with a hardcoded default JWT signing secret, "dev-secret-change-me", which is used to both sign and verify Bearer tokens. Because the safeguard meant to block this default in production only activates under a condition that most real-world deployments never trigger, an unauthenticated remote attacker can forge valid JWTs and impersonate any user, including workspace owners and administrators — earning this issue a maximum-severity CVSS score of 9.8.

Technical details

  • Root cause: praisonai_platform/services/auth_service.py defines a static, publicly known fallback secret ("dev-secret-change-me") used for HMAC-SHA256 JWT signing and verification when PLATFORM_JWT_SECRET is not explicitly configured.
  • Flawed guard logic: A check exists intended to reject the default secret in production, but it only fires when PLATFORM_ENV is explicitly set to a value other than "dev". Since PLATFORM_ENV itself defaults to "dev" when left unset, deployments that configure neither variable silently remain in the vulnerable state.
  • Trigger conditions: Any deployment of praisonai-platform that does not explicitly set PLATFORM_JWT_SECRET (and, due to the guard flaw, also does not explicitly set PLATFORM_ENV) runs with the known default signing key active.
  • Attack vector: Network, no authentication or user interaction required. An attacker who knows the public default secret can craft a JWT with arbitrary sub/email/role claims and present it as a valid Bearer token to any API route protected by the platform’s authentication middleware.
  • Impact: Full authentication bypass and account takeover — attackers can impersonate any existing user, including administrators, gaining unauthorized access to workspace management, project handling, and user access-control functions. All three impact categories (confidentiality, integrity, availability) are rated High.

Affected software

  • praisonai-platform (PyPI package) — versions ≤ 0.1.4

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade praisonai-platform to version 0.1.5 or later, where the insecure default-initialization logic has been corrected.
  • If immediate patching is not possible:
    • Explicitly set a strong, unique, randomly generated value for the PLATFORM_JWT_SECRET environment variable in every deployment — never rely on the built-in default.
    • Explicitly set PLATFORM_ENV to a non-development value (e.g., production) in production deployments to avoid unintentionally falling back to development behavior.
    • Restrict network exposure of the platform’s API endpoints to trusted networks until the environment variables above are verified as correctly configured.
    • After remediation, rotate any tokens/sessions issued under the default secret, as they should be considered compromised.

References

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