MervinPraison PraisonAI up to 4.6.39 praisonai.api.agent_invoke praisonai/api/call.py verify_token CALL_SERVER_TOKEN improper authentication

Summaryinfo

A vulnerability was found in MervinPraison PraisonAI up to 4.6.39. It has been rated as critical. Affected by this issue is the function verify_token of the file praisonai/api/call.py of the component praisonai.api.agent_invoke. The manipulation of the argument CALL_SERVER_TOKEN leads to improper authentication. This vulnerability is referenced as CVE-2026-47396. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in MervinPraison PraisonAI up to 4.6.39 and classified as critical. This issue affects the function verify_token of the file praisonai/api/call.py of the component praisonai.api.agent_invoke. The manipulation of the argument CALL_SERVER_TOKEN with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

PraisonAI is a multi-agent teams system. Prior to version 4.6.40, PraisonAI's call server exposes a network-facing agent control API without authentication when `CALL_SERVER_TOKEN` is not configured. The affected component is the `praisonai.api.agent_invoke` router as mounted by `praisonai.api.call`. The authentication helper `verify_token()` fails open when `CALL_SERVER_TOKEN` is unset. Since every sensitive agent-control endpoint depends on this helper, starting the call server without a token allows any reachable client to list agents, inspect agent metadata and instructions, invoke agents, and unregister agents. This is security-relevant because the bundled call server includes the vulnerable router and binds to `0.0.0.0`. As a result, operators who launch the call server without explicitly setting `CALL_SERVER_TOKEN` may unintentionally expose an unauthenticated remote agent control plane. Version 4.6.40 fixes the issue.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-47396 since 05/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 4.6.40 eliminates this vulnerability.

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Productinfo

Vendor

• MervinPraison

Name

• PraisonAI

Version

• 4.6.0
• 4.6.1
• 4.6.2
• 4.6.3
• 4.6.4
• 4.6.5
• 4.6.6
• 4.6.7
• 4.6.8
• 4.6.9
• 4.6.10
• 4.6.11
• 4.6.12
• 4.6.13
• 4.6.14
• 4.6.15
• 4.6.16
• 4.6.17
• 4.6.18
• 4.6.19
• 4.6.20
• 4.6.21
• 4.6.22
• 4.6.23
• 4.6.24
• 4.6.25
• 4.6.26
• 4.6.27
• 4.6.28
• 4.6.29
• 4.6.30
• 4.6.31
• 4.6.32
• 4.6.33
• 4.6.34
• 4.6.35
• 4.6.36
• 4.6.37
• 4.6.38
• 4.6.39

Website

• Product: https://github.com/MervinPraison/PraisonAI/

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