EUVD-2026-77456
GHSA-c2c5-ccw6-xvj5
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Authentication is entirely absent by default (empty key skips the check), so PR:N and AC:L; I:H for forged message injection and full LLM tool pipeline poisoning; A:L for persistent but conditional DoS via prod_mode registration.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
LangBot's debug WebSocket server binds to all interfaces on port 5401 and ships with an empty authentication key by default - and the official Docker image together with its docker-compose configuration publish that port to the host, placing every default deployment within reach of any network attacker. A remote unauthenticated attacker who reaches the /plugin/ws endpoint can register an arbitrary debug plugin, after which LangBot broadcasts the full plaintext context of every inbound IM message event to that plugin, enabling mass interception of private chats, forged bot replies, LLM pipeline poisoning via malicious tool registration, knowledge-base enumeration, and persistent denial of service by blocking legitimate plugin installations with the prod_mode flag. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three conditions that are all satisfied by the default deployment: (1) LangBot's plugin runtime is running on any version through 0.4.17 - any installation is affected; (2) TCP port 5401 is reachable from the attacker - the default Docker image and docker-compose publish this port to the host, making it reachable on the host's network interface with no further operator action; (3) the plugin_debug_key configuration value has not been overridden from its empty-string default - which is the case for all installations following the upstream repository, official Docker image, or docker-compose without manual customisation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base vector (AV:N/AC:L/AT:N/PR:N/UI:N) confirms fully unauthenticated, zero-complexity network exploitation with no prerequisites beyond port reachability, and the vendor-provided score of 8.8 reflects a high-severity finding. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch is available at time of publication; operators should monitor https://github.com/langbot-app/LangBot/security/advisories/GHSA-m7qm-2mjr-2h4q for a fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all LangBot instances in your environment and verify network connectivity to port 5401 from untrusted networks; document which instances have non-default authentication keys. …
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External POC / Exploit Code
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