EUVD-2026-23557Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
7DescriptionGitHub Advisory
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., {"$ne": ""}) as the password field. This NoSQL injection bypasses the password check, enabling login as any user including the root administrator. This issue has been fixed in version 4.14.9.5.
AnalysisAI
NoSQL injection in FastGPT <4.14.9.5 password authentication allows unauthenticated remote attackers to bypass login controls and access any account, including root administrator, by submitting MongoDB query operators instead of plaintext passwords. The vulnerability stems from missing runtime validation on password fields in the login endpoint. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions - remote unauthenticated exploitation against default configurations of FastGPT installations prior to version 4.14.9.5. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is CRITICAL based on multiple converging signals. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker identifies a FastGPT instance exposed on the public internet through Shodan or targeted reconnaissance. They send an HTTP POST request to the password login endpoint with JSON payload containing username 'root' and password field set to {"$ne": ""} instead of a string. … |
| Remediation | Upgrade immediately to FastGPT version 4.14.9.5 or later, available at https://github.com/labring/FastGPT/releases/tag/v4.14.9.5. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all FastGPT deployments running versions below 4.14.9.5 and inventory affected systems. …
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