How severe is CVE-2026-40252?

CVE-2026-40252 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-40252 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40252?

CVE-2026-40252 affects Fastgpt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40252?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40252 have an EU (EUVD) identifier?

Yes. CVE-2026-40252 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21605.

When was CVE-2026-40252 published?

CVE-2026-40252 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-40252

CVE-2026-40252 is a high-severity vulnerability in Fastgpt with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v4: 5.3
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21605
Weakness: CWE-284
Affected product: Fastgpt
Published: 2026-04-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-40252?: 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.
How severe is CVE-2026-40252?: CVE-2026-40252 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-40252 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40252?: CVE-2026-40252 affects Fastgpt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40252?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40252 have an EU (EUVD) identifier?: Yes. CVE-2026-40252 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21605.
When was CVE-2026-40252 published?: CVE-2026-40252 was published on 2026-04-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fastgpt:fastgpt:*:*:*:*:*:*:*:*

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