CVE-2026-81029 — OpenMetadata accepts a caller-supplied post-authentication redirect target and appends…¶
Key facts
CVE-2026-81029 is a High (8.1) vulnerability: OpenMetadata accepts a caller-supplied post-authentication redirect target and appends…. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-81029 |
| Severity | High (8.1) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-81029/ |
Details¶
English | 한국어
Description¶
OpenMetadata accepts a caller-supplied post-authentication redirect target and appends the issued token to it. SamlLoginServlet reads the callback request parameter and stores it in the HTTP session without comparing it against any configured or registered destination, and the assertion consumer servlet later formats that stored value into a URL carrying the freshly issued JWT together with the account's email and name before sending the redirect. The OIDC and OAuth2 handler follows the same pattern with its own redirect parameter and the issued identity token. A request naming a destination the attacker controls therefore causes the server to deliver a valid token for whoever completes the login to that destination. Because the token authenticates API calls as that account, a user who follows such a link and authenticates hands over control of their account. Version 2.0.0 removes the caller-supplied callback parameter; no 1.x release validates it.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-81029 |
| CVSS Score | 8.1 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-81029/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-2026-81029
# 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/open-metadata/OpenMetadata
- https://github.com/open-metadata/OpenMetadata/blob/1.12.1/openmetadata-service/src/main/java/org/openmetadata/service/security/saml/SamlLoginServlet.java
- https://github.com/open-metadata/OpenMetadata/issues/29662
- https://www.vulncheck.com/advisories/openmetadata-before-2.0.0-jwt-disclosure-via-unvalidated-saml-and-oidc-redirect-uri
- https://github.com/open-metadata/OpenMetadata/issues/29662
Generated by PoC Generator on 2026-08-30T19:17:48.249458951
Frequently asked questions¶
What is CVE-2026-81029?¶
CVE-2026-81029 is a High (8.1) vulnerability: OpenMetadata accepts a caller-supplied post-authentication redirect target and appends…. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-81029?¶
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-2026-81029?¶
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.