Vulnerability details
CVE-2026-111704
LangChat langchat
LangChat through commit 2a6285a Missing Authentication on REST API Controllers
CVSS 4.0
9.3Critical
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| LangChat | langchat | v ≤ 2a6285a6b8c51d51cdc599771bb667a30bc03f5c | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://github.com/LangChat/langchat/blob/2a6285a6b8c51d51cdc599771bb667a30bc03f5c/langchat-server/src/main/java/cn/langchat/server/config/WebAsyncConfig.java#L17-L33 technical-description
- https://github.com/LangChat/langchat/blob/2a6285a6b8c51d51cdc599771bb667a30bc03f5c/langchat-auth/src/main/java/cn/langchat/auth/controller/AigcUserController.java#L25-L60 technical-description
- https://github.com/LangChat/langchat/blob/2a6285a6b8c51d51cdc599771bb667a30bc03f5c/langchat-auth/src/main/java/cn/langchat/auth/service/impl/AuthServiceImpl.java#L51-L58 technical-description
- https://www.vulncheck.com/advisories/langchat-through-commit-2a6285a-missing-authentication-on-rest-api-controllers third-party-advisory
- https://hackmd.io/@hieuPenguinnn/langchat-missing-global-auth-credential-exposure third-party-advisory
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Details
- Published
- 2026-10-16
- Last updated
- 2026-10-22
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 27 · Low
Exploit prediction (EPSS)
0.65%
Probability of exploitation in 30 days
51.5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-306Missing Authentication for Critical Function