CVE-2026-92161 — FriendsOfFlarum OAuth allows users to log in to Flarum with GitHub, Twitter, Facebook,…¶
Key facts
CVE-2026-92161 is a Critical (9.8) vulnerability: FriendsOfFlarum OAuth allows users to log in to Flarum with GitHub, Twitter, Facebook,…. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-92161 |
| Severity | Critical (9.8) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-92161/ |
Details¶
English | 한국어
Description¶
FriendsOfFlarum OAuth allows users to log in to Flarum with GitHub, Twitter, Facebook, and other providers. Prior to 1.7.4 and 2.0.0-beta.4, the Discord OAuth provider does not check the verified field returned for an OAuth email before passing the address to Flarum core as trusted through provideTrustedEmail(). When Discord sign-in is enabled, an unauthenticated attacker who knows the email address of a Flarum user can configure a Discord account with that unverified address and a verified phone number, then sign in to cause Flarum to match the trusted address, link the attacker-controlled Discord identity to the existing user, and authenticate as the victim without a password or victim interaction. Exploitation requires that the victim's email address is not already associated with a Discord account, and it can compromise administrator accounts. Other bundled providers were not confirmed to be practically exploitable by this method because their relevant authentication flows return only verified or confirmed email addresses. This issue is fixed in versions 1.7.4 and 2.0.0-beta.4.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-92161 |
| CVSS Score | 9.8 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-92161/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-2026-92161
# 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/FriendsOfFlarum/oauth/commit/baca3466b3b7be51c70a7e0ba966901aefeb344a
- https://github.com/FriendsOfFlarum/oauth/commit/bb4bf376832e6bb68c579715d2a4b5a92c4a2567
- https://github.com/FriendsOfFlarum/oauth/releases/tag/1.7.4
- https://github.com/FriendsOfFlarum/oauth/releases/tag/2.0.0-beta.4
- https://github.com/FriendsOfFlarum/oauth/security/advisories/GHSA-g7vj-c29h-3h5m
Generated by PoC Generator on 2026-09-26T20:27:46.761091932
Frequently asked questions¶
What is CVE-2026-92161?¶
CVE-2026-92161 is a Critical (9.8) vulnerability: FriendsOfFlarum OAuth allows users to log in to Flarum with GitHub, Twitter, Facebook,…. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-92161?¶
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-2026-92161?¶
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.