by Kastro
Paper/Archive/CVE-2026-40351

CVE-2026-40351

labring FastGPT — FastGPT: NoSQL Injection in loginByPassword leads to Authentication Bypass

EPSS 0.6%public exploitCVSS 9.8
critical.is priorityof 100
49
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 50.1.501 × 2010.0Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

FastGPT is an AI Agent building platform. In versions prior to 4.14.9.5, the password-based login endpoint uses TypeScript type assertion without runtime validation, allowing an unauthenticated attacker to pass a MongoDB query operator object (e.g., {"$ne": ""}) as the password field. This NoSQL injection bypasses the password check, enabling login as any user including the root administrator. This issue has been fixed in version 4.14.9.5.

Affected

ProductAffectedFixed inSource
FastGPT< 4.14.9.5–CNA

Scores by source

GitHub_M (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

refgithub.com/labring/FastGPT/security/advisories/GHSA-x8mx-2mr7-h9xgrefgithub.com/labring/FastGPT/commit/bd966d479fbe414d02679cf79f9eaaab3d100a2drefgithub.com/labring/FastGPT/releases/tag/v4.14.9.5