CVE-2026-81027 — one-api gates one of its two channel-pinning paths and not the other.¶
Key facts
CVE-2026-81027 is a High (8.5) vulnerability: one-api gates one of its two channel-pinning paths and not the other.. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-81027 |
| Severity | High (8.5) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-81027/ |
Details¶
English | 한국어
Description¶
one-api gates one of its two channel-pinning paths and not the other. middleware/auth.go permits a request to name a specific channel either through a suffix on the API key or through a URL path parameter. The suffix path is reached only after model.IsAdmin succeeds and otherwise rejects the caller, while the path-parameter branch sets the selected-channel value from c.Param("channelid") with no role check at all. The route carrying that parameter sits behind token authentication only, so any account holding a valid API token reaches it. The value flows to the distributor, which loads the channel by integer identifier with no scoping to the caller's user or group, and then sets the outbound Authorization header to that channel's stored key and directs the request at the channel's base URL. A low-privilege account can therefore pin any channel by incrementing an identifier, causing the server to make upstream requests bearing an operator-configured provider key the account was never granted, and bypassing both the per-group restriction and the channel's model allowlist.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-81027 |
| CVSS Score | 8.5 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-81027/poc.py
Usage¶
# Run PoC against target
python3 poc.py --target <TARGET_URL>
# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>
⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.
Test Lab¶
This repository includes a Docker-based test environment with both vulnerable and patched applications.
Quick Start¶
# Clone and navigate to CVE directory
cd CVE-2026-81027
# Start both applications
docker-compose up -d
# Run tests
./run-tests.sh # Linux/Mac
./run-tests.ps1 # Windows PowerShell
Application Endpoints¶
| Application | URL | Status |
|---|---|---|
| Vulnerable App | http://localhost:8080 | Shows vulnerability |
| Patched App | http://localhost:8081 | Demonstrates fix |
Directory Structure¶
├── README.md # English documentation
├── README_KO.md # Korean documentation
├── poc.py # PoC detection script
├── docker-compose.yml # Container orchestration
├── run-tests.sh # Linux/Mac test runner
├── run-tests.ps1 # Windows test runner
├── vulnerable-app/ # Vulnerable version
│ ├── app.py
│ ├── Dockerfile
│ └── requirements.txt
└── patched-app/ # Fixed version
├── app.py
├── Dockerfile
└── requirements.txt
References¶
- https://github.com/songquanpeng/one-api
- https://github.com/songquanpeng/one-api/blob/v0.6.10/middleware/auth.go
- https://github.com/songquanpeng/one-api/issues/2410
- https://www.vulncheck.com/advisories/one-api-through-0.6.10-missing-authorization-on-url-parameter-channel-pinning
- https://github.com/songquanpeng/one-api/issues/2410
Generated by PoC Generator on 2026-08-30T19:25:51.112732867
Frequently asked questions¶
What is CVE-2026-81027?¶
CVE-2026-81027 is a High (8.5) vulnerability: one-api gates one of its two channel-pinning paths and not the other.. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-81027?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2026-81027?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
For authorized security testing and research only. See the full source and NVD record.