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CVE-2026-40351

CRITICAL Exploitation: PoC
9.8
CVSS 3.1
Description
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.

Metadata

CVE ID
CVE-2026-40351
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-04-10 22:50 UTC
Published
2026-04-17 21:05 UTC
Last updated
2026-04-20 14:57 UTC
Primary CWE
CWE-943
CWE-943: Improper Neutralization of Special Elements in Data…
Vendor / Product
labring / FastGPT
Sources
cve.org  ·  NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
yes
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
labring FastGPT — < 4.14.9.5
Weakness (CWE)
CWESourceDescription
CWE-943 cna CWE-943: Improper Neutralization of Special Elements in Data Query Logic
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.8 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References (3)
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