CVE-2026-55418: high-severity vulnerability in labring FastGPT
FastGPT: S3 presign/read handlers do not bind the object key to the caller's team (cross-team file disclosure)
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.6epss 0.5%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Affected products
labring · FastGPTRelated CVEs — labring FastGPT
In the same product, most dangerous first.
CVE-2026-42302CRITICALFastGPT: Unauthenticated Remote Code Execution (RCE) via code-server Misconfiguration in agent-sandboxEPSS 0.7%CVE-2026-40351CRITICALFastGPT: NoSQL Injection in loginByPassword leads to Authentication BypassEPSS 0.6%CVE-2025-49131MEDIUMFastGPT Sandbox Vulnerable to Sandbox BypassEPSS 0.5%CVE-2026-68929CRITICALFastGPT: Unauthenticated WeChat channel hijack and denial of service via shareId-only authorizationEPSS 0.4%CVE-2026-34162CRITICALFastGPT: Unauthenticated SSRF via httpTools Endpoint Leads to Internal API Key TheftEPSS 0.4%CVE-2026-61684HIGHFastGPT: Unauthenticated cross-tenant data access via forgeable plugin-invoke JWT (default INVOKE_TOKEN_SECRET='token')EPSS 0.4%