CVE-2026-48031 — go-base is a Go RESTful API Boilerplate template with JWT Authentication, backed by…¶

Key facts

CVE-2026-48031 is a Critical (9.1) vulnerability: go-base is a Go RESTful API Boilerplate template with JWT Authentication, backed by…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-48031
Severity	Critical (9.1)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-48031/

Details¶

English | 한국어

Description¶

go-base is a Go RESTful API Boilerplate template with JWT Authentication, backed by PostgreSQL. In versions prior to 2026-05-18, the JWT signing secret is hardcoded to the known string "random", letting any attacker who reads the public repository forge tokens for arbitrary users, including admin roles, and completely bypass authentication on all protected endpoints. This value is set in two places: the dev.env template (line 10) and a programmatic fallback in cmd/serve.go (line 35), so the application uses it even when no .env file is present. The original mitigation in auth/jwt/tokenauth.go (lines 22 to 25) only caught the exact string "random", letting other weak secrets through, and replaced it with an in-memory key that was not persisted, invalidating all tokens on every restart and effectively causing a denial-of-service. This issue has been fixed in version 2026-05-18.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-48031
Type	XSS
CVSS Score	9.1

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-48031/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-2026-48031

# 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/dhax/go-base/commit/cc82b9740fa6b08e0fad409cd4b418e240dd0e00
https://github.com/dhax/go-base/pull/31
https://github.com/dhax/go-base/security/advisories/GHSA-mqq6-462x-jxmm
https://github.com/dhax/go-base/security/advisories/GHSA-mqq6-462x-jxmm

Generated by PoC Generator on 2026-08-04T05:40:48.772191912

Frequently asked questions¶

What is CVE-2026-48031?¶

CVE-2026-48031 is a Critical (9.1) vulnerability: go-base is a Go RESTful API Boilerplate template with JWT Authentication, backed by…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-48031?¶

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-2026-48031?¶

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.