PraisonAI ToolsMCPServer legacy SSE transport accepts attacker Host/Origin and exposes registered tools

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-57112
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-15 11:17:10 UTC
Updated2026-09-16 18:17:09 UTC
DescriptionPraisonAI is a multi-agent teams system. From praisonaiagents 0.6.0 until 1.6.59 and PraisonAI 3.10.0 until 4.6.59, ToolsMCPServer.run_sse() in src/praisonai-agents/praisonaiagents/mcp/mcp_server.py mounts SseServerTransport on the legacy /sse and /messages/ endpoints without default Host, Origin, or authentication enforcement. A malicious website can use DNS rebinding against a reachable local or internal SSE server, supply attacker-controlled Host and Origin headers, enumerate registered tools, and invoke them with the server user's privileges. The Streamable HTTP transport rejects the same hostile Origin, which isolates the flaw to the legacy SSE wrapper. An initial remediation was released in praisonaiagents 1.6.59 and PraisonAI 4.6.59.

Risk And Classification

Primary CVSS: v3.1 8.3 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS: 0.001930000 probability, percentile 0.091600000 (date 2026-09-16)

Problem Types: CWE-306 | CWE-346 | CWE-862 | CWE-306 CWE-306: Missing Authentication for Critical Function | CWE-346 CWE-346: Origin Validation Error | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.3HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1CNADECLARED8.3HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA MervinPraison PraisonAI affected >= 3.10.0, < 4.6.59 Not specified
CNA MervinPraison Praisonaiagents affected >= 0.6.0, < 1.6.59 Not specified

References

ReferenceSourceLinkTags
github.com/MervinPraison/PraisonAI/security/advisories/GHSA-vmf9-xx9w-86wx 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/MervinPraison/PraisonAI/releases/tag/v4.6.59 [email protected] github.com
github.com/MervinPraison/PraisonAI/commit/2adfe7e8323f6deec66925cf15a885... [email protected] github.com
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