EUVD-2026-42116Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Network-reachable importer abused by an authenticated team member (PR:L), no interaction; SSRF reaches other systems (S:C) to disclose data (C:H) with no integrity or availability impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionCVE.org
FastGPT is a knowledge-based AI application platform. Prior to 4.15.0-beta4, the HTTP-tool OpenAPI schema importer validates only the top-level URL before passing it to SwaggerParser.bundle, whose remote reference resolver fetches $ref URLs without FastGPT's internal-address guard and returns fetched content inline, allowing an authenticated team member to read internal services or cloud metadata. This issue is fixed in version 4.15.0-beta4.
AnalysisAI
Server-side request forgery in FastGPT before 4.15.0-beta4 lets an authenticated team member abuse the HTTP-tool OpenAPI schema importer to reach internal-only services and cloud instance metadata. Because the importer only validates the top-level URL and then hands the document to SwaggerParser.bundle, whose $ref resolver fetches remote references without FastGPT's internal-address guard, fetched content is returned inline to the caller. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated FastGPT team member account (CVSS PR:L) with access to the HTTP-tool feature, and the specific prerequisite that the target instance uses the OpenAPI/Swagger schema importer path that calls SwaggerParser.bundle on user-supplied schemas. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N = 7.7 High) is internally consistent with the description: network-reachable, low complexity, requires low privilege (an authenticated team member), no user interaction, scope change (the app reaches systems it should not), and high confidentiality impact with no integrity or availability effect. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated FastGPT team member creates an HTTP tool and supplies an OpenAPI schema whose top-level URL points to an attacker-controlled host that passes FastGPT's guard, but which contains a $ref pointing to http://169.254.169.254/latest/meta-data/iam/security-credentials/ or an internal service. When FastGPT bundles the schema, SwaggerParser resolves that $ref without the internal-address guard and returns the cloud IAM credentials or internal response inline to the user. … |
| Remediation | Vendor-released patch: 4.15.0-beta4 - upgrade FastGPT to 4.15.0-beta4 (or later) as described in advisory GHSA-72hf-5382-2mq9 (https://github.com/labring/FastGPT/security/advisories/GHSA-72hf-5382-2mq9); note this is a beta tag, so validate in staging before production rollout. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all FastGPT installations, note current versions, and inventory authenticated users with HTTP-tool access. …
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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)
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External POC / Exploit Code
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