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CVE-2026-55418

8.6 · HIGH

FastGPT is an open source AI knowledge base platform.

Published Jul 7, 2026CWE-639EPSS 0.48%

Overview

CVE-2026-55418 is a high-severity vulnerability. It was published on July 7, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

FastGPT is an open source AI knowledge base platform. Prior to v4.15.0-beta5, two FastGPT file handlers authorize an unrelated resource and then sign or read an S3 object using a key taken directly from the request, without checking that the key belongs to the caller's team. Because S3 object keys are global within the bucket and carry the tenant id only as a path segment, an attacker can supply another team's key and obtain its file contents through the chat-file presign endpoint or dataset preview endpoint. This issue is fixed in version v4.15.0-beta5.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396cGitHubgithub.com/labring/FastGPT/pull/7104GitHubgithub.com/labring/FastGPT/releases/tag/v4.15.0-beta5GitHubgithub.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55418?

CVE-2026-55418 is a high-severity vulnerability. It was published on July 7, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-55418?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-55418?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55418?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55418 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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