CVE-2026-55418
highpriority · track · 0EPSS 0.005 · 41 %ileEUEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (1)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (12)
External citations — patches, advisories, analysis.
- https://github.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396ccnnvd
- https://github.com/labring/FastGPT/pull/7104cnnvd
- https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5cnnvd
- https://github.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5cnnvd
- https://github.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396cenisa_euvd
- https://github.com/labring/FastGPT/pull/7104enisa_euvd
- https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5enisa_euvd
- https://github.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5enisa_euvd
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