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CVE-2026-40351 is a NoSQL injection vulnerability in FastGPT, an AI agent building platform, affecting versions prior to 4.14.9.5. The flaw is in the password-based login endpoint, which relies on a TypeScript type assertion for the password field without performing runtime validation. Because attacker-controlled input is not enforced to be a primitive string at runtime, an unauthenticated attacker can submit a MongoDB query operator object such as {"$ne":""} in place of the password. This crafted object alters the backend query logic and bypasses password verification, allowing authentication as arbitrary accounts, including the root administrator.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.