obsproject/obs-studio

Prevent loading Mouse1/Mouse2 as hotkeys

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#13403 opened on May 5, 2026

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Good first issue

Description

The UI currently prevents settings Mouse1 or Mouse2 or hotkeys, however if someone modifies their scene collection json to add these hotkeys, OBS will still load them and cause all sorts of weird behaviour.

The frontend prevents setting these as hotkeys, and libobs should similarly avoid loading them.

https://github.com/obsproject/obs-studio/blob/25fbaf7bb8d29cfd80d711e8f9f98c6638deab21/libobs/obs-hotkey.c#L469-L486

I think we would likely do so here, but it would good for someone to thoroughly investigate this and ensure it's the correct place to do so.

Contributor guide

Tech stack
c
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
C programmingOBS codebase navigationhotkey system understanding
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the hotkey loading logic in libobs/obs hotkey.c around line 469-486. Determine how Mouse1/Mouse2 hotkeys are currently stored and loaded. Implement a check to prevent them from being loaded from the scene collection JSON. Ensure the fix covers all relevant code paths. Review any existing tests or comments for guidance.