CVE-2026-45019 Chainlit: SSRF via MCP SSE and streamable-http transports allows unauthenticated internal network access

Chainlit is a Python framework for building production-ready conversational AI applications. From 2.4.0rc0 until 2.12.0, Chainlit deployments with features.mcp.enabled set to true in .chainlit/config.toml expose the POST /mcp endpoint without requiring authentication. For sse and streamable-http...

GHSA-W3FX-MC44-MF6J Chainlit has command injection via MCP stdio transport that allows unauthenticated remote code execution

Am I affected? Only if your deployment sets features.mcp.enabled = true in .chainlit/config.toml. MCP has been disabled by default since v2.7.0, so most Chainlit deployments are not affected. No authentication is required: /mcp is reachable by any client that can open a session. Summary When MCP ...

CVE-2026-45018 Chainlit: Command injection via MCP stdio transport allows unauthenticated remote code execution

Chainlit is a Python framework for building production-ready conversational AI applications. From 2.4.0rc0 until 2.12.0, Chainlit deployments with features.mcp.enabled set to true in .chainlit/config.toml expose the POST /mcp endpoint without requiring authentication. For stdio transport, the...

CVE-2026-45018

Chainlit (Python framework for conversational AI applications) is vulnerable to command injection via its MCP stdio transport in versions 2.4.0rc0 through 2.12.0 . When features.mcp.enabled is set to true, the POST /mcp endpoint is exposed without authentication . The validate_mcp_command() funct...

CVE-2026-45018 Chainlit: Command injection via MCP stdio transport allows unauthenticated remote code execution

Chainlit is a Python framework for building production-ready conversational AI applications. From 2.4.0rc0 until 2.12.0, Chainlit deployments with features.mcp.enabled set to true in .chainlit/config.toml expose the POST /mcp endpoint without requiring authentication. For stdio transport, the...

PT-2026-81492

Name of the Vulnerable Software and Affected Versions Chainlit versions 2.4.0rc0 through 2.11.x Description Chainlit deployments with features.mcp.enabled set to true in .chainlit/config.toml expose the 'POST /mcp' endpoint without authentication. The ConnectSseMCPRequest and...

PT-2026-81486

Name of the Vulnerable Software and Affected Versions Chainlit versions 2.4.0rc0 through 2.11.9 Description Deployments with features.mcp.enabled set to true in .chainlit/config.toml expose the 'POST /mcp' endpoint without authentication. For stdio transport, the endpoint accepts a user-controlle...

PYSEC-2026-1237 Chainlit contain a server-side request forgery (SSRF) vulnerability

Chainlit versions prior to 2.9.4 contain a server-side request forgery SSRF vulnerability in the /project/element update flow when configured with the SQLAlchemy data layer backend. An authenticated client can provide a user-controlled url value in an Element, which is fetched by the SQLAlchemy...

PYSEC-2026-1238 Chainlit contains an authorization bypass vulnerability

Chainlit versions prior to 2.8.5 contain an authorization bypass through user-controlled key vulnerability. If this vulnerability is exploited, threads may be viewed or thread ownership may be obtained by an attacker who can log in to the product...

Missing Authorization

Overview chainlit is a Build Conversational AI. Affected versions of this package are vulnerable to Missing Authorization via the restoreexistingsession path in the WebSocket session restoration. An attacker can gain unauthorized access to another user's session and assume their permissions and...

CVE-2026-56104

CVE-2026-56104 affects Chainlit prior to 2.10.1. A session-hijacking flaw lets unauthenticated attackers restore and inherit an authenticated user session by presenting a valid sessionId during WebSocket session restoration, without ownership verification. The attacker can exploit the restore_exi...

CVE-2026-56104 Chainlit < 2.10.1 Session Hijacking via WebSocket Session Restoration

Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by presenting a valid sessionId during WebSocket session restoration without ownership verification. Attackers can exploit the...

EUVD-2026-38285

Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by presenting a valid sessionId during WebSocket session restoration without ownership verification. Attackers can exploit the...

CVE-2026-56104 Chainlit < 2.10.1 Session Hijacking via WebSocket Session Restoration

Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by presenting a valid sessionId during WebSocket session restoration without ownership verification. Attackers can exploit the...

CVE-2026-56104

Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by presenting a valid sessionId during WebSocket session restoration without ownership verification. Attackers can exploit the...

CVE-2026-56104 Chainlit < 2.10.1 Session Hijacking via WebSocket Session Restoration

Chainlit before 2.10.1 contains a session hijacking vulnerability that allows unauthenticated attackers to restore and inherit authenticated user sessions by presenting a valid sessionId during WebSocket session restoration without ownership verification. Attackers can exploit the...

PT-2026-51339

Name of the Vulnerable Software and Affected Versions Chainlit versions prior to 2.10.1 Description An issue exists where unauthenticated attackers can restore and inherit authenticated user sessions. This occurs during WebSocket session restoration when a valid sessionId is presented without...

PraisonAI: Hardcoded `approval_mode="auto"` in Chainlit UI Overrides Administrator Configuration, Enabling Unapproved Shell Command Execution

Summary The Chainlit UI modules chat.py and code.py hardcode config.approvalmode = "auto" after loading administrator configuration from the PRAISONAPPROVALMODE environment variable, silently overriding any "manual" or "scoped" approval setting. This defeats the human-in-the-loop approval gate fo...

GHSA-QWGJ-RRPJ-75XM PraisonAI: Hardcoded `approval_mode="auto"` in Chainlit UI Overrides Administrator Configuration, Enabling Unapproved Shell Command Execution

Summary The Chainlit UI modules chat.py and code.py hardcode config.approvalmode = "auto" after loading administrator configuration from the PRAISONAPPROVALMODE environment variable, silently overriding any "manual" or "scoped" approval setting. This defeats the human-in-the-loop approval gate fo...

Server-Side Request Forgery (SSRF)

Chainlit is vulnerable to Server-Side Request Forgery SSRF. The vulnerability is due to fetching attacker-controlled URLs during element updates, where the SQLAlchemy data layer performs outbound HTTP GET requests on user-supplied url values, allowing authenticated attackers to access internal...