Capcut Bug Bounty Fix

Best for: Quick engagement.

Tweet 1: 🛠️ Fixed it! Just closed a bug bounty ticket with @CapCut_app.

Found a nasty vulnerability that exposed [specific feature]. The team was incredibly responsive and pushed a fix in record time. 🚀

Tweet 2: This is why bug bounties are essential for modern apps. Creators trust these platforms with their content—security can't be an afterthought. capcut bug bounty fix

Shoutout to the engineering team for the smooth coordination! 🤝 #BugBounty #InfoSec

This paper presents a comprehensive analysis of a security vulnerability discovered in CapCut (a short-video editing mobile/web app), the impact and exploitability of the bug, and a step-by-step remediation plan suitable for a bug-bounty submission and for developers to implement. The vulnerability is treated generically as an insecure file-handling / arbitrary file upload leading to remote code execution (RCE) and/or unauthorized access — a common high-impact class for media/web apps. Replace specifics (endpoints, parameter names, PoC payloads) with your actual findings before submission.

  • PoC payload examples: (Redact actual exploit strings in public reports; include detailed payloads in private disclosure)
  • Expected vs. Actual Behavior: Expected: uploads sanitized and stored safely as blobs, no execution. Actual: crafted file leads to code execution or data exposure.

    • ByteDance is actively hardening CapCut because it is now a critical piece of enterprise software for TikTok Shop sellers. Best for: Quick engagement

    The current top bounties (July 2025 estimates):

    The best "fix" strategy: Focus on the Cloud Collaboration feature (new in 2025). This is where CapCut is least mature. Look for Insecure Direct Object References (IDOR) – can you view another user's cloud draft by changing an ID in the URL? That is a $2,000 bug.

    If you are a developer fixing a reported bug: This paper presents a comprehensive analysis of a

    Title: IDOR in project sharing endpoint allows viewing any user's project

    Steps to reproduce:
    


    Impact: Any authenticated user can view any other user’s project data.
    

    Proposed fix (code-level):
In backend handler for /api/project/:id:
    


    Patch suggestion (pseudo):
function getProject(req, res) 
const project = db.findProject(req.params.id);
if (project.ownerId !== req.user.id) 
return res.status(403).json( error: "Unauthorized" );
return res.json(project);