---
id: "CVE-2026-111704"
kind: "vulnerability"
aliases: ["CVE-2026-111704"]
title: "LangChat through commit 2a6285a contains a missing authentication vulnerability that allows unauthenticated remote\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: false
status: "open"
category: "ai-tooling"
products: [{"name": "langchat", "fixed": [], "affected": "<= commit 2a6285a6b8c51d51cdc599771bb667a30bc03f5c (no release tags)", "ecosystem": "github"}]
ecosystems: ["github"]
tags: ["ai-tooling", "langchat", "llm-api-keys", "self-hosted", "spring-boot"]
not_affected_if: ["default-config", "not-network-reachable"]
published_at: "2026-10-16T18:17:54+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-23T22:28:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111704", "first_seen_at": "2026-10-23T21:57:13+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T22:28:34+00:00"}]
---

# LangChat through commit 2a6285a contains a missing authentication vulnerability that allows unauthenticated remote…

LangChat, an AI chat application, does not register its Sa-Token authentication interceptor, so its REST controllers accept unauthenticated requests. An unauthenticated remote attacker can read user passwords and LLM provider API keys, create super-admin accounts, and modify or delete data.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- github:langchat affected <= commit 2a6285a6b8c51d51cdc599771bb667a30bc03f5c (no release tags) fixed ?

## How to check

Self-hosted only. From a host outside your network, run: curl -i http://<host>:8080/api/v1/auth/users with no Authorization header (default port 8080). A 200 with a user list means exposed; also try /api/v1/aigc/models. In source: no SaInterceptor, SaServletFilter or HandlerInterceptor registered, and @SaCheckLogin only on /api/v1/auth/me and /api/v1/auth/access-routes. Any build from the next branch at or before 2a6285a6b8c51d51cdc599771bb667a30bc03f5c is affected.

## Fix

No fixed version. Until upstream ships one: keep LangChat off untrusted networks or put an authenticating reverse proxy in front. Or register a global Sa-Token SaInterceptor requiring login on all routes except login/logout, add permission checks on admin controllers, and stop serializing password and apiKey. Treat all stored LLM provider API keys and user passwords as exposed: rotate them, and check aigc_user for unexpected admin accounts.

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111704
- 2026-10-23T22:28:34+00:00 analyst — No patched LangChat exists: project publishes no release tags, the default branch next head was 2a6285a (Sep 27) on the GitHub commits page I read, and VulnCheck, CVE record and finder name no fix. Found by source review only; CISA-ADP SSVC says exploitation: poc (the write-up has illustrative requests, no runnable PoC). Not seen exploited.

## Documents

- [advisory] LangChat missing global auth (finder write-up, hieuPenguinnn) https://hackmd.io/@hieuPenguinnn/langchat-missing-global-auth-credential-exposure
- [advisory] VulnCheck advisory: LangChat missing authentication https://www.vulncheck.com/advisories/langchat-through-commit-2a6285a-missing-authentication-on-rest-api-controllers
- [mitigation] LangChat: the REST API answers callers who never logged in https://theinjection.dev/items/langchat-rest-controllers-missing-auth/

## From the sources

LangChat through commit 2a6285a contains a missing authentication vulnerability that allows unauthenticated remote attackers to access REST controllers because no Sa-Token interceptor is registered. Attackers can query /api/v1/auth/users to read plaintext passwords, retrieve LLM provider API keys, create super-admin accounts, and modify or delete data.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_