Is CVE-2026-40351 in the CISA KEV catalog?

No. CVE-2026-40351 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-40351?

CVE-2026-40351 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2026-40351?

CVE-2026-40351 has an EPSS score of 0.63% (46th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40351?

Upgrade fastgpt to 4.14.9.5 or later.

CVE & CISA-KEV Catalog

CVE-2026-40351

CRITICAL

9.8

CVSS v3

NVD

Description

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.

CWE-943

How to fix

Remediation Available

fastgptNVD

Affected:< 4.14.9.5Fixed in:4.14.9.5CVE-2026-40351derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.63%probability of exploitation in 30 days

46thpercentile

Moderate risk: more likely to be exploited than 46% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Release Notes1

github.com

Related Vulnerabilities

Other CWE-943 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-12904	High	8.8	6.4%	-	Fix
CVE-2020-36195	Critical	9.8	1.8%	-	Fix
CVE-2018-7829	High	8.8	1.7%	-	Fix
CVE-2021-1349	Medium	6.5	1.4%	-	Fix
CVE-2018-19952	High	7.5	1.3%	-	Fix
CVE-2022-36084	Critical	9.9	1.2%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-27.