CVE-2026-40351
CRITICALFastGPT: NoSQL Injection in loginByPassword leads to Authentication Bypass
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/labring/FastGPT/security/advisories/GHSA-x8mx-2mr7-h9xg
X_Refsource_Misc x_refsource_misc
https://github.com/labring/FastGPT/commit/bd966d479fbe414d02679cf79f9eaaab3d100a2d
X_Refsource_Misc x_refsource_misc
https://github.com/labring/FastGPT/releases/tag/v4.14.9.5
Scores
CVSS v3
9.8
EPSS
0.0063
EPSS Percentile
45.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
total
Details
CWE
CWE-943
Status
published
Products (2)
fastgpt/fastgpt
< 4.14.9.5
labring/FastGPT
< 4.14.9.5
Published
Apr 17, 2026
Tracked Since
Apr 18, 2026