CVE-2026-82285

Received Received - Intake

Server-Side Request Forgery in Bisheng Workflow API

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: VulnCheck

Description

bisheng through 2.6.0-fix2 contains a server-side request forgery vulnerability in the POST /api/v1/workflow/report/callback endpoint that lacks authentication and applies no URL scheme restrictions or host filtering. Unauthenticated attackers can supply arbitrary URLs to enumerate internal network services and cloud metadata endpoints, then retrieve captured responses from object storage using caller-supplied object names.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-28

Last Modified

2026-08-28

Generated

2026-08-29

AI Q&A

2026-08-29

EPSS Evaluated

N/A

NVD

CVE-2026-82285

EUVD

EUVD-2026-67816

Affected Vendors & Products

Vendor	Product	Version / Range
bisheng	bisheng	to 2.6.0-fix2 (inc)
dataelement	bisheng	to 2.6.0-fix2 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

CVE-2026-82285 is an unauthenticated Server-Side Request Forgery (SSRF) vulnerability in the Bisheng application affecting versions up to 2.6.0-fix2. It exists in the POST /api/v1/workflow/report/callback endpoint which accepts arbitrary URLs without authentication or URL restrictions. Attackers can send crafted requests to probe internal network services, access cloud metadata APIs (like AWS IMDSv1 or GCP metadata), and store fetched responses in MinIO object storage using attacker-controlled keys.

Detection Guidance

To detect this vulnerability, monitor network traffic for unauthorized requests to internal services or cloud metadata endpoints from the POST /api/v1/workflow/report/callback endpoint. Check logs for unusual outbound HTTP requests to private IPs or metadata service URLs (e.g., AWS IMDSv1 at 169.254.169.254). Inspect MinIO storage for unexpected .docx files in workflow/report/ paths.

Impact Analysis

This vulnerability allows unauthenticated attackers to enumerate internal network services and cloud metadata endpoints, potentially exposing sensitive data like cloud IAM credentials. Attackers can also retrieve captured responses from MinIO storage and may poison stored data. The impact includes unauthorized access to internal resources, data exfiltration, and potential service disruption.

Mitigation Strategies

Immediately disable or restrict access to the POST /api/v1/workflow/report/callback endpoint. Implement strict URL scheme restrictions (allow only http/https) and host allowlisting. Add authentication requirements for this endpoint. Update Bisheng to a patched version if available. Monitor MinIO for unauthorized file access or modifications.

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