Account takeover via MongoDB operator injection
Published Apr 17, 2026 · Updated Apr 17, 2026
NoSQL injection in FastGPT before 4.14.9.5 allows remote authenticated users to reset an account password without the old password. The updatePasswordByOld handler passes the unvalidated oldPsw value into MongoUser.findOne, so a MongoDB operator object can satisfy the password filter. A valid low-privileged session is required; the reset preserves control of the compromised account, while changing another account also requires separate ID manipulation.
Summary
What happened
NoSQL injection in FastGPT before 4.14.9.5 allows remote authenticated users to reset an account password without the old password. The updatePasswordByOld handler passes the unvalidated oldPsw value into MongoUser.findOne, so a MongoDB operator object can satisfy the password filter. A valid low-privileged session is required; the reset preserves control of the compromised account, while changing another account also requires separate ID manipulation.
The record
- CVE
- CVE-2026-40352
- Published
- Apr 17, 2026
- Updated
- Apr 17, 2026
- Vendor
- Labring
- Product
- FastGPT
- Classifications
- CWE-943, T1098
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 17, 2026CVE publishedPublication date reported by the CVE source.
- Apr 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.14.9.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- FastGPT updatePasswordByOld curl proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo