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CVE-2026-112265

LangBot through 4.11.0 Missing Lark/Feishu Webhook Authenticity Verification

LangBot through 4.11.0 contains a missing authenticity verification vulnerability that allows unauthenticated attackers to inject forged Lark/Feishu events by skipping signature checks. Attackers knowing a bot UUID can POST fabricated im.message.receive_v1 or card.action.trigger events to drive the LLM pipeline, tools, and approvals as other users.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Langbot
Products
Langbot
CVE-2026-90562

LangBot before 4.10.11 Authentication Bypass via Weak Recovery Key

LangBot before 4.10.11 generates password recovery keys with only 24 bits of entropy and applies no rate limiting to the unauthenticated reset-password endpoint. Remote attackers knowing the administrator email can exhaust the keyspace through concurrent requests to reset the admin password and gain account access.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Langbot
Products
Langbot
CVE-2026-90938

LangBot through 0.4.17 Unauthenticated Plugin Registration via WebSocket

LangBot's plugin runtime (pip package langbot_plugin) through 0.4.17 starts a debug WebSocket server on 0.0.0.0:5401 (/plugin/ws) whose authentication is gated on plugin_debug_key, which defaults to an empty string and is never set by the upstream repository, Docker image, or docker-compose (which additionally publishes port 5401 to the host); the key check is therefore skipped entirely. Any remote attacker able to reach the port can register an arbitrary "debug plugin" without credentials. Because events are broadcast to all initialized plugins without filtering, the attacker's plugin receives the full context of every IM message event (including private chats, message chains, and user/sender IDs in plaintext) and can inject forged replies, send messages as any configured bot, enumerate bot UUIDs, invoke configured LLM models, read knowledge-base contents, and register malicious tools that feed every user's LLM pipeline. Registering with "prod_mode": true causes later legitimate installations of a plugin with the same author/name to be rejected, resulting in persistent denial of service. No patched version was available at the time of publication.

CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Langbot
Products
Langbot
CVE-2026-54449

LangBot: Authenticated RCE Via MCP Configuration

LangBot is a global IM bot platform designed for LLMs. In version 4.10.7 and earlier, any authenticated user can add or change an STDIO MCP server configuration without an adequate authorization boundary. In src/langbot/pkg/provider/tools/loaders/mcp.py, StdioServerParameters accepts the configured command and arguments and starts a server-side subprocess on the LangBot server. An attacker who can sign up or obtain an account can use the Extensions MCP configuration to execute arbitrary commands with the privileges of the LangBot service, enabling data disclosure, modification, and service disruption. No fixed version is available as of this review.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Langbot
Products
Langbot
CVE-2026-28509

LangBot has a Cross Site Scripting(XSS) Vulnerability

LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, LangBot’s web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) vulnerability. This issue has been patched in version 4.8.7.

CVSS 3.1 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Langbot
Products
Langbot
CVE-2025-59835

LangBot has a cross-directory file upload vulnerability, which could lead to system takeover

LangBot is a global IM bot platform designed for LLMs. In versions 4.1.0 up to but not including 4.3.5, authorized attackers can exploit the /api/v1/files/documents interface to perform arbitrary file uploads. Since this interface does not strictly restrict the storage directory of files on the server, it is possible to upload dangerous files to specific system directories. This is fixed in version 4.3.5.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Langbot
Products
Langbot