Writing High-Quality Bug Reports
Structure reports with clear steps to reproduce, impact assessment, and PoC screenshots or code.
Writing High-Quality Bug Reports is a free Cyber Security Academy lesson on CoddyKit — lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Cyber Security Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Why Report Quality Matters
A high-quality report gets triaged faster, is less likely to be marked as duplicate or informational, receives accurate severity assessment, and builds your reputation with programs. Poor reports — even for critical bugs — may be dismissed or under-valued.
Required Report Sections
Every quality report includes: vulnerability title, severity assessment with CVSS justification, affected asset (URL/endpoint), description of the issue, step-by-step reproduction, proof of concept, impact assessment, and suggested remediation.
The Title
A good title is specific and informative: "IDOR on /api/v2/users/{id} allows any authenticated user to access private profile data" is better than "Authorization bypass." Include: vulnerability type, affected endpoint, and the impact in one sentence.
Step-by-Step Reproduction
Write reproduction steps so that a junior developer who has never seen this bug can reproduce it. Number each step. Include exact HTTP requests (copy from Burp Suite). Include any required preconditions (account type, geographic restriction, time of day).
Proof of Concept (PoC)
Include screenshots, screen recordings, or Burp Suite HTTP request/response captures that prove the vulnerability exists. For IDOR: show Account A accessing Account B's data with the modified request and the response showing B's data.
Impact Assessment
Clearly explain the business impact: "An attacker can access the full name, email, phone number, and billing address of any user by iterating IDs." Quantify where possible: "The user table has 2 million records, all accessible." Tie technical impact to business risk.
CVSS Scoring
Many programs use CVSS 3.1 to score severity. Learn the six base metrics: AV (attack vector), AC (complexity), PR (privileges required), UI (user interaction), S (scope), C/I/A (impact). Accurately scoring CVSS signals expertise and speeds triage.
Avoiding Common Mistakes
Common report mistakes: no PoC attached, reproducing steps missing preconditions, impact understated (don't say "low" for account takeover), theoretical vulnerabilities without proof they are exploitable, and duplicate submissions without checking disclosed reports first.
HTTP Request Evidence
Paste the exact HTTP request and response (with sensitive data redacted — don't include other users' PII beyond what's necessary). Use Burp Suite's "Copy as curl" feature to provide a one-line reproduction command reviewers can run immediately.
Communicating During Triage
Respond promptly to triage questions. If asked for clarification, provide it within 24-48 hours. Professional, courteous communication builds long-term relationships with security teams and increases chances of retesting credit and bonus rewards.
Learning from Disclosed Reports
Read top-rated reports on HackerOne and Bugcrowd disclosure pages. Study how elite researchers structure reports, demonstrate impact, and chain vulnerabilities. Replicate their formatting and impact articulation in your own submissions.
Knowledge Check
What is the most important element that distinguishes a high-quality bug report from a poor one?
Summary
High-quality bug reports combine a specific title, clear reproduction steps, concrete proof of concept, accurate CVSS scoring, and compelling business impact assessment. Investing in report quality maximizes rewards, builds reputation, and speeds triage for security teams.
Frequently asked questions
Is the “Writing High-Quality Bug Reports” lesson free?
Yes — the full text of “Writing High-Quality Bug Reports” is free to read here on the web, and the Cyber Security Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Cyber Security Academy course, upgrade to CoddyKit PRO.
What will I learn in “Writing High-Quality Bug Reports”?
Structure reports with clear steps to reproduce, impact assessment, and PoC screenshots or code. You practise Cyber Security Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Cyber Security Academy?
No prior experience is required. Cyber Security Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 2 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Writing High-Quality Bug Reports” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Cyber Security Academy lesson?
Yes. Every Cyber Security Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.