Is Codeforces Custom Contests safe?
Codeforces Custom Contests accepts cross-origin messages that create Codeforces gym contests from supplied problem and invite data.
On Codeforces /contests?complete=true&customContest, the content script listens for window messages without checking the sender origin. A GROUP_CONTEST_CREATE message makes Codeforces requests using the page CSRF token to query problems, save a mashup, edit a gym contest, invite supplied participants, and redirect to the new contest.
Part of this rating comes from analysis signals we haven't published as detailed findings yet.
AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.
Publishers can request a review.
What it can do
Permissions this extension asks for, as declared in version 1.1.3. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.
Read and change your data on codeforces.com
*://codeforces.com/*
Store data in your browser
storage
Where it sends data
Destinations our analysis observed Codeforces Custom Contests contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.
- codeforces.com
Codeforces Custom Contests sends data to codeforces.com. 2 other extensions we have analysed send data here.