CVE-2026-40352: FastGPT: NoSQL Injection in updatePasswordByOld Leads to Account Takeover

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-17 · updated 2026-10-26
Weakness: CWE-943

Description

FastGPT is an AI Agent building platform. In versions prior to 4.14.9.5, the password change endpoint is vulnerable to NoSQL injection. An authenticated attacker can bypass the "old password" verification by injecting MongoDB query operators. This allows an attacker who has gained a low-privileged session to change the password of their account (or others if combined with ID manipulation) without knowing the current one, leading to full account takeover and persistence. This issue has been fixed in version 4.14.9.5.

Affected products

labring FastGPT: before 4.14.9.5 — fixed in 4.14.9.5

How to fix

Upgrade to a fixed version: labring FastGPT 4.14.9.5. Check the vendor advisory for mitigations.

References

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