CVE Explorer
CVE-2026-55418
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 pre
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"FastGPT","vendor":"labring","versions":[{"status":"affected","version":"< 4.15.0-beta5"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:948dcce1a9d5409601bb600c1e193f33682659da3975980ae5dc416daf6d9832 · sha256:4203c27cfad61e84… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:948dcce1a9d5409601bb600c1e193f33682659da3975980ae5dc416daf6d9832 · sha256:4203c27cfad61e84… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-639","description":"CWE-639: Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:948dcce1a9d5409601bb600c1e193f33682659da3975980ae5dc416daf6d9832 · sha256:4203c27cfad61e84… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"https://github.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396c","tags":["x_refsource_MISC"],"url":"https://github.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396c"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:948dcce1a9d5409601bb600c1e193f33682659da3975980ae5dc416daf6d9832 · sha256:4203c27cfad61e84… · /containers/cna/references/2
{"name":"https://github.com/labring/FastGPT/pull/7104","tags":["x_refsource_MISC"],"url":"https://github.com/labring/FastGPT/pull/7104"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:948dcce1a9d5409601bb600c1e193f33682659da3975980ae5dc416daf6d9832 · sha256:4203c27cfad61e84… · /containers/cna/references/1
{"name":"https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5","tags":["x_refsource_MISC"],"url":"https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:948dcce1a9d5409601bb600c1e193f33682659da3975980ae5dc416daf6d9832 · sha256:4203c27cfad61e84… · /containers/cna/references/3
{"name":"https://github.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5","tags":["x_refsource_CONFIRM"],"url":"https://github.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:948dcce1a9d5409601bb600c1e193f33682659da3975980ae5dc416daf6d9832 · sha256:4203c27cfad61e84… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.