Chainlit contains a session hijacking vulnerability

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...

PYSEC-2026-4028 Chainlit contains a session hijacking vulnerability

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...

swarm-plus (>=0.0.0.1, <=0.1.0) potentially affected by CVE-2026-56104 via chainlit (1.3.1)

chainlit PYPI version 1.3.1 is affected by a known vulnerability. The following packages have a transitive dependency on chainlit and may be impacted: - swarm-plus =0.0.0.1, =0.1.0 Source cves: CVE-2026-56104 Source advisory: OSV:PYSEC-2026-4028...

agentic-kernel (>=0.1.0, <=0.1.10), boterview (1.3.0) +4 more potentially affected by CVE-2026-56104 via chainlit (>=2.4.400, <=2.6.3)

chainlit PYPI version =2.4.400, =0.1.0, =0.1.1, =0.1.0, =0.2.2, =0.2.4 Source cves: CVE-2026-56104 Source advisory: OSV:PYSEC-2026-4028...

edubotics-core (>=0.1.3, <=0.1.7) potentially affected by CVE-2026-56104 via chainlit (1.2.0)

chainlit PYPI version 1.2.0 is affected by a known vulnerability. The following packages have a transitive dependency on chainlit and may be impacted: - edubotics-core =0.1.3, =0.1.7 Source cves: CVE-2026-56104 Source advisory: OSV:PYSEC-2026-4028...

dictatorgenai (0.1.0), lit-data-layers (>=0.1.0, <=0.1.4) potentially affected by CVE-2026-56104 via chainlit (1.3.2)

chainlit PYPI version 1.3.2 is affected by a known vulnerability. The following packages have a transitive dependency on chainlit and may be impacted: - dictatorgenai 0.1.0 - lit-data-layers =0.1.0, =0.1.4 Source cves: CVE-2026-56104 Source advisory: OSV:PYSEC-2026-4028...

PT-2026-105788

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 restore existin...

PYSEC-2026-3812 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 ...

PYSEC-2026-3811 Chainlist has SSRF via MCP SSE and streamable-http transports that allows unauthenticated internal network access

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 ...

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. SummaryWhen MCP is...

Chainlist has SSRF via MCP SSE and streamable-http transports that allows unauthenticated internal network access

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. SummaryWhen MCP is...

agentic-kernel (>=0.1.0, <=0.1.10), boterview (1.3.0) +6 more potentially affected by CVE-2026-45019 via chainlit (>=2.4.400, <=2.11.1)

chainlit PYPI version =2.4.400, =0.1.0, =0.1.1, =0.1.0, =0.1.0, =0.2.2, =0.7.5, =0.7.10 Source cves: CVE-2026-45019 Source advisory: OSV:PYSEC-2026-3811...

agentic-kernel (>=0.1.0, <=0.1.10), boterview (1.3.0) +6 more potentially affected by CVE-2026-45018 via chainlit (>=2.4.400, <=2.11.1)

chainlit PYPI version =2.4.400, =0.1.0, =0.1.1, =0.1.0, =0.1.0, =0.2.2, =0.7.5, =0.7.10 Source cves: CVE-2026-45018 Source advisory: OSV:PYSEC-2026-3812...

Directory Traversal

Overview chainlit is a Build Conversational AI. Affected versions of this package are vulnerable to Directory Traversal via the client-supplied sessionId handling in backend/chainlit/session.py and backend/chainlit/socket.py. An attacker can delete arbitrary directories accessible to the service...

CVE-2026-86099

Chainlit through 2.12.0 fails to validate the client-supplied socket.io sessionId parameter, allowing unauthenticated attackers to traverse filesystem paths by injecting absolute or relative path sequences. Attackers can craft malicious sessionId values that escape the upload directory and...

CVE-2026-86099 Chainlit through 2.12.0 Path Traversal via socket.io sessionId

Chainlit through 2.12.0 fails to validate the client-supplied socket.io sessionId parameter, allowing unauthenticated attackers to traverse filesystem paths by injecting absolute or relative path sequences. Attackers can craft malicious sessionId values that escape the upload directory and...

CVE-2026-86099 Chainlit through 2.12.0 Path Traversal via socket.io sessionId

Chainlit through 2.12.0 fails to validate the client-supplied socket.io sessionId parameter, allowing unauthenticated attackers to traverse filesystem paths by injecting absolute or relative path sequences. Attackers can craft malicious sessionId values that escape the upload directory and...

CVE-2026-86099 Chainlit through 2.12.0 Path Traversal via socket.io sessionId

Chainlit through 2.12.0 fails to validate the client-supplied socket.io sessionId parameter, allowing unauthenticated attackers to traverse filesystem paths by injecting absolute or relative path sequences. Attackers can craft malicious sessionId values that escape the upload directory and...

EUVD-2026-74908

Chainlit through 2.12.0 fails to validate the client-supplied socket.io sessionId parameter, allowing unauthenticated attackers to traverse filesystem paths by injecting absolute or relative path sequences. Attackers can craft malicious sessionId values that escape the upload directory and...

CVE-2026-86099

Chainlit versions through 2.12.0 fail to validate the client-supplied socket.io sessionId parameter, enabling unauthenticated attackers to perform path traversal by injecting absolute or relative path sequences. Maliciously crafted sessionId values can escape the upload directory and recursively ...