Vulnerability in Fastgpt
CVE-2026-40351
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Fastgpt
- Labring Fastgpt — versions < 4.14.9.5
Weakness classification (CWE)
References
- github.com/labring/FastGPT/security/advisories/GHSA-x8mx-2mr7-h9xg (Exploit, Mitigation, Vendor Advisory)
- github.com/labring/FastGPT/commit/bd966d479fbe414d02679cf79f9eaaab3d100a2d (Patch)
- github.com/labring/FastGPT/releases/tag/v4.14.9.5 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-40351?
- CVE-2026-40351 is a critical-severity vulnerability in Fastgpt, classified under Improper Neutralization of Special Elements in Data Query Logic. CVSS score: 9.8/10. Published 2026-04-17.
- How severe is CVE-2026-40351?
- Critical severity. CVSS v3 base score is 9.8 out of 10.