CVE-2026-33075

FastGPT has Arbitrary Code Execution in GitHub Actions via pull_request_target in fastgpt-preview-image.yml

Published Mar 20, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed

Description

FastGPT is an AI Agent building platform. In versions 4.14.8.3 and below, the fastgpt-preview-image.yml workflow is vulnerable to arbitrary code execution and secret exfiltration by any external contributor. It uses pull_request_target (which runs with access to repository secrets) but checks out code from the pull request author's fork, then builds and pushes Docker images using attacker-controlled Dockerfiles. This also enables a supply chain attack via the production container registry. A patch was not available at the time of publication.

Analysis

Technical impact

FastGPT v4.14.8.3 and earlier have a workflow that uses the pull_request_target trigger, which runs with access to repository secrets, and checks out the code from the pull request author's fork. An attacker can supply a crafted Dockerfile that is built and pushed to the production container registry, granting remote code execution and enabling secret exfiltration. The weakness involves CWE‑494 (Unrestricted Write to File) and CWE‑829 (Improper Restriction of XML External Entity Reference). This flaw allows an external contributor to execute arbitrary code on the CI runner and compromise all secrets exposed to the workflow.

Affected Systems

The vulnerability affects the FastGPT platform from labring. Affected software versions are 4.14.8.3 and below. No other products or versions are listed.

Risk and Exploitability

The CVSS score is 9.4, indicating critical severity. The EPSS score is less than 1%, suggesting a low probability of exploitation detected in the wild so far, and the vulnerability is not listed in the CISA KEV catalog. Nonetheless, the attack vector is publicly available via the GitHub Actions pull_request_target mechanism, meaning that any open pull request can be used by an attacker to trigger the exploit. Once the forked code is merged into the CI pipeline, the attacker can execute arbitrary code and exfiltrate secrets.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

labring

FastGPT

affected

Version	Status	Constraints
`<= 4.14.8.3`	affected	—

Configuration 1 [-]

cpe:2.3:a:fastgpt:fastgpt:*:*:*:*:*:*:*:*

No data.

Vendor Product Versions

Labring

Fastgpt

Version	Status	Scheme	Platform
`[0,4.14.8.3]`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Modify the fastgpt-preview-image.yml workflow to use pull_request instead of pull_request_target or remove the use of sensitive secrets from the workflow
Restrict access to repository secrets so that only a controlled workflow can use them
Validate and whitelist Dockerfile contents before building images
Update FastGPT to a version newer than 4.14.8.3 once a patch is released
Monitor GitHub Actions logs for unexpected Docker builds or secret usage

Generated by OpenCVE AI on March 23, 2026 at 16:26 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact High

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.309% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact total

References

Link	Providers
https://github.com/labring/FastGPT/security/advisories/GHSA-xfx8-w35j-485c

History

Mar 23, 2026 3:45 PM First appearance in the feed. Affected versions updated. Affected vendors updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
First Time appeared		Fastgpt Fastgpt fastgpt
CPEs		cpe:2.3:a:fastgpt:fastgpt::::::::
Vendors & Products		Fastgpt Fastgpt fastgpt
Metrics		cvssV3_1 `{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Mar 20, 2026 2:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Mar 20, 2026 10:30 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Labring Labring fastgpt
Vendors & Products		Labring Labring fastgpt

Mar 20, 2026 8:45 AM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		FastGPT is an AI Agent building platform. In versions 4.14.8.3 and below, the fastgpt-preview-image.yml workflow is vulnerable to arbitrary code execution and secret exfiltration by any external contributor. It uses pull_request_target (which runs with access to repository secrets) but checks out code from the pull request author's fork, then builds and pushes Docker images using attacker-controlled Dockerfiles. This also enables a supply chain attack via the production container registry. A patch was not available at the time of publication.
Title		FastGPT has Arbitrary Code Execution in GitHub Actions via pull_request_target in fastgpt-preview-image.yml
Weaknesses		CWE-494 CWE-829
References		https://github.com/labring/FastGPT/security/advisories/GHSA-xfx8-w35j-485c
Metrics		cvssV4_0 `{'score': 9.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}`