CVE-2026-111704

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/LangChat/langchat/blob/2a6285a6b8c51d51cdc599771bb667a30bc03f5c/langchat-auth/src/main/java/cn/langchat/auth/controller/AigcUserController.java#L25-L60
https://github.com/LangChat/langchat/blob/2a6285a6b8c51d51cdc599771bb667a30bc03f5c/langchat-auth/src/main/java/cn/langchat/auth/service/impl/AuthServiceImpl.java#L51-L58
https://github.com/LangChat/langchat/blob/2a6285a6b8c51d51cdc599771bb667a30bc03f5c/langchat-server/src/main/java/cn/langchat/server/config/WebAsyncConfig.java#L17-L33
https://hackmd.io/@hieuPenguinnn/langchat-missing-global-auth-credential-exposure
https://www.vulncheck.com/advisories/langchat-through-commit-2a6285a-missing-authentication-on-rest-api-controllers
https://hackmd.io/@hieuPenguinnn/langchat-missing-global-auth-credential-exposure

Configurations

No configuration.

History

21 Oct 2026, 22:16

Type	Values Removed	Values Added
References	~~() https://hackmd.io/@hieuPenguinnn/langchat-missing-global-auth-credential-exposure -~~	() https://hackmd.io/@hieuPenguinnn/langchat-missing-global-auth-credential-exposure -

16 Oct 2026, 18:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-16 18:17

Updated : 2026-10-21 22:16

NVD link : CVE-2026-111704

Mitre link : CVE-2026-111704

CVE.ORG link : CVE-2026-111704

JSON object : View

Products Affected

No product.

CWE

CWE-306

Missing Authentication for Critical Function

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