CVE-2026-40352: fastgpt — Exploit & Fix

Description

FastGPT is an AI Agent building platform. In versions prior to 4.14.9.5, the password change endpoint is vulnerable to NoSQL injection. An authenticated attacker can bypass the "old password" verification by injecting MongoDB query operators. This allows an attacker who has gained a low-privileged session to change the password of their account (or others if combined with ID manipulation) without knowing the current one, leading to full account takeover and persistence. This issue has been fixed in version 4.14.9.5.

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CVSS v3.1 Score

8.8

HIGH

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

EPSS — Exploit Prediction

0.0003

Probability of exploitation

0.09%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-943 CWE-943

Affected Products

Vendor	Product	Versions
fastgpt	fastgpt	< 4.14.9.5

References

Advisories & Patches

https://github.com/labring/FastGPT/commit/bd966d479fbe414d02679cf79f9eaaab3d100a2d https://github.com/labring/FastGPT/security/advisories/GHSA-422w-vrfj-72g6

Exploits

https://github.com/labring/FastGPT/security/advisories/GHSA-422w-vrfj-72g6

Other References

https://github.com/labring/FastGPT/releases/tag/v4.14.9.5

Frequently Asked Questions

What is CVE-2026-40352? +

FastGPT is an AI Agent building platform. In versions prior to 4.14.9.5, the password change endpoint is vulnerable to NoSQL injection. An authenticated attacker can bypass the "old password" verification by injecting MongoDB query operators. This allows an attacker who has gained a low-privileged session to change the password of their account (or others if combined with ID manipulation) without knowing the current one, leading to full account takeover and persistence. This issue has been fixed in version 4.14.9.5. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-40352? +

CVE-2026-40352 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0003, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-40352? +

CVE-2026-40352 affects products from fastgpt, specifically: fastgpt. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-40352? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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