FastGPT NoSQL Injection: Account Takeover Risk
The National Vulnerability Database (NVD) has detailed CVE-2026-40352, a high-severity NoSQL injection vulnerability affecting FastGPT, an AI Agent building platform. Specifically, versions prior to 4.14.9.5 are susceptible through the password change endpoint. This flaw carries a CVSS score of 8.8 (HIGH).
According to the NVD, an authenticated attacker can bypass the ‘old password’ verification by injecting MongoDB query operators. This means a low-privileged session is all an attacker needs to change an account’s password without prior knowledge of the current one. The NVD notes this could lead to full account takeover and persistence, especially if combined with ID manipulation to target other users.
This is a critical flaw. It undermines the fundamental security control of password verification. Defenders running FastGPT instances must prioritize patching to version 4.14.9.5 immediately. Attackers are constantly looking for ways to escalate privileges from a low-level foothold, and this vulnerability provides a direct path to full control, effectively negating any multi-factor authentication if the password can be reset.
What This Means For You
- If your organization uses FastGPT, you must immediately verify your version. If you are running anything prior to 4.14.9.5, patch without delay. Audit logs for any suspicious password change attempts, especially from low-privileged accounts, as this vulnerability allows full account takeover.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-40352 - FastGPT Password Change NoSQL Injection
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-40352 | Auth Bypass | FastGPT versions prior to 4.14.9.5 |
| CVE-2026-40352 | NoSQLi | FastGPT password change endpoint |
| CVE-2026-40352 | Account Takeover | Bypass 'old password' verification via MongoDB query operator injection |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 18, 2026 at 01:16 UTC |
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