PraisonAI ToolsMCPServer legacy SSE transport accepts attacker Host/Origin and exposes registered tools
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MervinPraison | PraisonAI | 3.10.0 to before 4.6.59 | 4.6.59 | Patch available | CNA |
| MervinPraison | praisonaiagents | 0.6.0 to before 1.6.59 | 1.6.59 | Patch available | CNA |
| — | praisonaiagents (PyPI) | 0.6.0 to before 1.6.59 | 1.6.59 | Patch available | GHSA-vmf9-xx9w-86wx |
| — | praisonai (PyPI) | 3.10.0 to before 4.6.59 | 4.6.59 | Patch available | GHSA-vmf9-xx9w-86wx |
- PraisonAI VendorMervinPraison Affected 3.10.0 to before 4.6.59 Fixed in 4.6.59 Patch available CNA
- praisonaiagents VendorMervinPraison Affected 0.6.0 to before 1.6.59 Fixed in 1.6.59 Patch available CNA
- praisonaiagents (PyPI) Vendor— Affected 0.6.0 to before 1.6.59 Fixed in 1.6.59 Patch available GHSA-vmf9-xx9w-86wx
- praisonai (PyPI) Vendor— Affected 3.10.0 to before 4.6.59 Fixed in 4.6.59 Patch available GHSA-vmf9-xx9w-86wx
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:* | — | — | MervinPraison |
- cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:* Versions — — ·MervinPraison
Remediation
- Fix · CNA PraisonAI (MervinPraison) Fixed in 4.6.59
- Fix · CNA praisonaiagents (MervinPraison) Fixed in 1.6.59
- Fix · GHSA-vmf9-xx9w-86wx praisonaiagents (PyPI) Fixed in 1.6.59 Advisory →
- Fix · GHSA-vmf9-xx9w-86wx praisonai (PyPI) Fixed in 4.6.59 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-57112
- 2026-10-03 Alias added: GHSA-vmf9-xx9w-86wx
References
More MervinPraison vulnerabilities
- TI-2026-79619 Missing authentication in PraisonAI AgentOS exposes agent chat CVSS 3.1CRITICAL 9.8
- TI-2026-71236 Missing access control in PraisonAI AgentTeam exposes agent endpoints CVSS 3.1CRITICAL 9.8
- TI-2026-44052 PraisonAI before 1.6.78 Remote Code Execution via CodeAgent CVSS 4.0CRITICAL 10.0
- TI-2026-41123 praisonai-platform 0.1.4 still boots on the hardcoded JWT secret dev-secret-change-me (default-open production guard) CVSS 3.1CRITICAL 9.8
- TI-2026-41122 praisonai-platform: default JWT signing secret 'dev-secret-change-me' enables token forgery CVSS 3.1CRITICAL 9.8
- TI-2026-41118 PraisonAI MCPServer exposes unauthenticated HTTP tools/call CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-57112 · CVE Program
- CVE-2026-57112 · NVD
- FIRST EPSS
- GHSA-vmf9-xx9w-86wx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences