CVE-2026-68899 — Wekan is open source kanban built with Meteor.¶

Key facts

CVE-2026-68899 is a High (8.7) vulnerability: Wekan is open source kanban built with Meteor.. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-68899
Severity	High (8.7)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-68899/

Details¶

English | 한국어

Description¶

Wekan is open source kanban built with Meteor. Prior to 9.90, isFileValid() in models/fileValidation.js used the Unix file command for content-based MIME detection, but detectMimeFromFile() silently returned undefined when that binary was unavailable and the validation fell back to the attacker-controlled fileObj.type supplied through server/routes/attachmentApi.js. On deployments with WITH_API=true and no file binary, an authenticated board member could label HTML containing JavaScript as image/png, bypass the dangerous MIME check, and store active content under the Wekan origin for execution when another user opened it. Version 9.90 adds looksLikeDangerousMarkup() to inspect file bytes and force dangerous-content scanning when MIME detection is unavailable. This issue is fixed in version 9.90.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-68899
Type	RCE
CVSS Score	8.7

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-68899/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-2026-68899

# 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/wekan/wekan/commit/f6ba472f6738bcd3763f133d3d9970f216df2263
https://github.com/wekan/wekan/releases/tag/v9.90
https://github.com/wekan/wekan/security/advisories/GHSA-jhph-whx8-wq6p

Generated by PoC Generator on 2026-08-23T19:49:47.850418672

Frequently asked questions¶

What is CVE-2026-68899?¶

CVE-2026-68899 is a High (8.7) vulnerability: Wekan is open source kanban built with Meteor.. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-68899?¶

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-2026-68899?¶

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.