BISHENG Unauthenticated Server-Side Request Forgery via Workflow Report Callback

Advisories

BISHENG Unauthenticated Server-Side Request Forgery via Workflow Report Callback

severity: high
date: 8/28/2026
Affecting: bisheng <= 2.6.0-fix2
CVE: CVE-2026-82285
CWE: CWE-918 Server-Side Request Forgery (SSRF)
CVSS: 8.8
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
References: GitHub Issue #2190
https://github.com/dataelement/bisheng
Vulnerable code: workflow.py
Credit: George Chen
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.

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