Critical 9.8Published Oct 16, 2026

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

Updated under an hour ago (Oct 28, 2026, 1:10 PM ET)

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EPSS puts the chance of exploitation in the next 30 days at 0.65%, higher than 51% of scored CVEs.

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Every CVE for langchat

Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-306
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.65% (percentile 51)
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 16, 2026

Affected products

Affected products

LangChat langchat langchat:langchat (from the name)	through 2a6285a6b8c51d51cdc599771bb667a30bc03f5c	CNA record

References

References

https://hackmd.io/@hieuPenguinnn/langchat-missing-global-auth-credential-exposure	third-party-advisory
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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.