PraisonAI ToolsMCPServer legacy SSE transport accepts attacker Host/Origin and exposes registered tools (MervinPraison PraisonAI)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.22 % · percentile 13 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Deferred
Description
PraisonAI 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.
Weaknesses (CWE)
- CWE-306 — Missing Authentication for Critical Functionality
- CWE-346 — Origin Validation Error
- CWE-862 — Missing Authorization
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.3 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H | GitHub_M |
| CVSS 3.1 | HIGH 8.3 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-vmf9-xx9w-86wx — PraisonAI ToolsMCPServer legacy SSE transport accepts attacker Host/Origin and exposes registered tools
- PYSEC-2026-3521 — PraisonAI ToolsMCPServer legacy SSE transport accepts attacker Host/Origin and exposes registered tools
- PYSEC-2026-3534 — PraisonAI ToolsMCPServer legacy SSE transport accepts attacker Host/Origin and exposes registered tools
European references
- ENISA EUVD · EUVD-2026-78424
- GCVE · GCVE-0-2026-57112
Affected products
| Product | Versions |
|---|---|
| MervinPraison · PraisonAI | affected >= 3.10.0, < 4.6.59 |
| MervinPraison · praisonaiagents | affected >= 0.6.0, < 1.6.59 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |