CVE-2026-50562: FastGPT: Untrusted PR artifacts are pushed and deployed by privileged preview workflows

Severity: critical (CVSS 9.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-15 · updated 2026-10-24
Weakness: CWE-266

Description

FastGPT is a knowledge-based AI application platform. At commit 22ebfacbb43311e9b73294040ae0eb87390c6bba and earlier, artifacts built from untrusted pull request code in .github/workflows/preview-docs-build.yml and .github/workflows/preview-fastgpt-build.yml can be downloaded by privileged workflow_run jobs in .github/workflows/preview-docs-push.yml and .github/workflows/preview-fastgpt-push.yml, allowing attacker-controlled Docker images from the document/ tree or FastGPT build context to be pushed to GHCR and, for documentation previews, deployed with secrets.KUBE_CONFIG_CN.

Affected products

labring FastGPT: through 22ebfacbb43311e9b73294040ae0eb87390c6bba

References

https://github.com/labring/FastGPT/security/advisories/GHSA-rvgc-2c29-g876

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