Mods and plugins are third party code that your players run on their own machines or on your servers. Safe handling starts with choosing a trust model: either sandbox mods so they cannot reach much, or review and sign what you host. Most communities need both, plus a quick way to pull a bad mod.
Why mods are a supply chain problem
A popular mod behaves like a popular package. Many people install it, updates arrive automatically or semi automatically, and the author is often one volunteer. If the account is taken over or the author turns, the next update reaches everyone. That is the same shape as other supply chain problems, only with a friendlier community around it.
Choose a trust model
Data only mods. If mods are only textures, maps and configuration, the risk is mostly in the parsers. Keep file parsing code updated and validate formats strictly.
Scripted mods in a sandbox. If mods run scripts inside a restricted interpreter, deny file, network and process access by default and grant specific capabilities. Make the interpreter itself a dependency you patch.
Native code mods. These run with the player's full permissions. Treat them as installing any program: warn clearly, and consider whether to allow them at all on your official channels.
Server plugins
Server operators run plugins on machines that may hold player data and payment hooks. Give operators a permission model for plugins, and publish guidance telling them to read what they install, run game servers with minimal rights and keep secrets out of plugin reach. The OWASP secrets management guidance applies: do not hardcode secrets, scope credentials narrowly, and revoke immediately if one leaks.
What hosting platforms should do
- Apply the upload checklist from the OWASP file upload guidance: allowlist types, verify real content, rename files, limit size, isolate storage.
- Show who published the mod and when the owner last changed.
- Require stronger authentication for authors of popular mods, since their accounts are the valuable target.
- Verify update integrity with hashes or signatures so a modified file is detectable.
- Keep a takedown and rollback path, and tell installed users when a version was pulled.
What players should be told
Give plain advice: install from official sources, check update history, be wary of mods that ask for unusual permissions, and treat executable add ons like downloaded programs. A short in client note at install time works better than a long policy.
What mod authors should do
Pin and review their own dependencies, enable multi factor authentication on publishing accounts, and keep release credentials out of the repository.
Incident readiness
Decide ahead of time who can pull a mod, how you notify users, and how you will check whether other mods by the same author are affected. Practise it once.
Checklist
- State your trust model for each mod type.
- Sandbox scripted content by default.
- Protect author accounts with MFA.
- Hash or sign released files and verify on install.
- Maintain a revoke and notify process.
Safeguard can scan dependencies for the tooling and servers that run mods, and enforce policies on what enters your own builds. Free scan: https://gold.safeguard.sh/scan.
Quick check
Are mods safer if the community reviews them?
Review helps but does not replace sandboxing, signed updates and a way to pull a bad version quickly.
Sources
Last reviewed: 19 October 2026.
