Is CVE-2026-40252 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-40252, but active exploitation has not been confirmed.

Can CVE-2026-40252 be exploited remotely?

Yes. CVE-2026-40252 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40252?

CVE-2026-40252 has a CVSS score of 5.3 (MEDIUM).

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MEDIUMPOC

CVE-2026-40252

CWE-284Published: April 10, 2026· Updated: Apr 13, 2026

5.3

CVSS v3.1

Official Description

FastGPT is an AI Agent building platform. Prior to 4.14.10.4, Broken Access Control vulnerability (IDOR/BOLA) allows any authenticated team to access and execute applications belonging to other teams by supplying a foreign appId. While the API correctly validates the team token, it does not verify that the requested application belongs to the authenticated team. This leads to cross-tenant data exposure and unauthorized execution of private AI workflows. This vulnerability is fixed in 4.14.10.4.

NVD Source

Technical Analysis

CVE-2026-40252 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2026-40252. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.Low

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X