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CVE-2026-111704— LangChat through commit 2a6285a Missing Authentication on REST API Controllers

Quick assessment

Affected
LangChat langchat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

截至提交 2a6285a，LangChat 存在身份验证缺失漏洞。由于未注册 Sa-Token 拦截器，未认证的远程攻击者能够访问 REST 控制器。攻击者可通过查询 /api/v1/auth/users 接口读取明文密码、获取大语言模型（LLM）提供方的 API 密钥、创建超级管理员账户，以及修改或删除数据。

CVSS 9.8 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
LangChat langchat ≤ 2a6285a6b8c51d51cdc599771bb667a30bc03f5c affected
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I. Basic Information for CVE-2026-111704

Vulnerability Information
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Vulnerability Title
LangChat through commit 2a6285a Missing Authentication on REST API Controllers
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
LangChat langchat 0 ~ 2a6285a6b8c51d51cdc599771bb667a30bc03f5c -

II. Public POCs for CVE-2026-111704

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-111704

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Patches & Fixes for CVE-2026-111704 (1)

Vendor Advisories for CVE-2026-111704 (1)

Proof of Concept for CVE-2026-111704 (1)

Security Blog Posts for CVE-2026-111704 (1)

Other References for CVE-2026-111704 (1)

IV. Related Vulnerabilities

Same weakness: CWE-306

V. Comments for CVE-2026-111704

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