Critical severity · published Oct 16, 2026
CVE-2026-111704
LangChat through commit 2a6285a Missing Authentication on REST API Controllers
9.8
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LA
langchat · LangChat
through 2a6285a6b8c51d51cdc599771bb667a30bc03f5c · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111704
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111704
github.com
https://github.com/LangChat/langchat/blob/2a6285a6b8c51d51cdc599771bb667a30bc03f5c/langchat-auth/src/main/java/cn/langchat/auth/controller/AigcUserController.java#L25-L60
github.com
https://github.com/LangChat/langchat/blob/2a6285a6b8c51d51cdc599771bb667a30bc03f5c/langchat-auth/src/main/java/cn/langchat/auth/service/impl/AuthServiceImpl.java#L51-L58
github.com
https://github.com/LangChat/langchat/blob/2a6285a6b8c51d51cdc599771bb667a30bc03f5c/langchat-server/src/main/java/cn/langchat/server/config/WebAsyncConfig.java#L17-L33
hackmd.io
https://hackmd.io/@hieuPenguinnn/langchat-missing-global-auth-credential-exposure
www.vulncheck.com
https://www.vulncheck.com/advisories/langchat-through-commit-2a6285a-missing-authentication-on-rest-api-controllers