CVE-2026-105106 — Koha is vulnerable to OS command injection in the Task Scheduler deletion path.¶

Key facts

CVE-2026-105106 is a High (8.8) vulnerability: Koha is vulnerable to OS command injection in the Task Scheduler deletion path.. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-105106
Severity	High (8.8)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-105106/

Details¶

English | 한국어

Description¶

Koha is vulnerable to OS command injection in the Task Scheduler deletion path. The tools/scheduler.pl handler accepts the jobid request parameter for op=cud-delete and passes it to C4::Scheduler::remove_at_job without validating it. Schedule::At::remove substitutes the supplied job ID into an atrm command string without quoting or escaping it and executes the command through a single-argument system() call, which invokes the shell. An authenticated staff user with the tools => schedule_tasks permission can therefore execute arbitrary operating-system commands as the Koha web/application user by supplying shell metacharacters in jobid. The issue is fixed in Koha 24.11.20, 25.05.15, 25.11.09, and 26.05.04, and in the 26.11 development branch.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-105106
Type	RCE
CVSS Score	8.8

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-105106/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-2026-105106

# 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://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=42674
https://download.koha-community.org/
https://www.cve.org/CVERecord?id=CVE-2024-28739
https://www.cve.org/CVERecord?id=CVE-2025-30076

Generated by PoC Generator on 2026-10-14T17:54:36.638104175

Frequently asked questions¶

What is CVE-2026-105106?¶

CVE-2026-105106 is a High (8.8) vulnerability: Koha is vulnerable to OS command injection in the Task Scheduler deletion path.. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-105106?¶

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-2026-105106?¶

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.