find-security-vulnerabilities-in-code
Find security vulnerabilities in a codebase or repository with Strix — a white-box AI security review that reads your source, reasons about the actual data flow and authorization model, then exploits what it finds in a live sandbox so every reported issue has a working proof-of-concept instead of a noisy static-analysis alert. Covers injection, XSS, SSRF, broken access control and IDOR, insecure deserialization, secrets in code, unsafe dependencies, and business-logic flaws. Use when the user asks to security-scan, security-review, or audit their code, repo, or pull request for vulnerabilities.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/usestrix/strix --skill find-security-vulnerabilities-in-code- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads find-security-vulnerabilities-in-code automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
Find security vulnerabilities in code
White-box security review with Strix: the agents read the source to build a model of routes, sinks, and authorization checks, then attempt real exploitation. Findings come with a proof-of-concept, so the output is a short list of proven issues rather than the hundreds of "potential" hits a pattern-matching scanner produces.
Install, LLM setup, all flags, and the managed-cloud path are in the penetration-testing-with-strix skill. For a run with no Docker and no LLM key, the same binary drives the managed platform: strix cloud login, then strix cloud scans start ... (details in managed-pentesting-with-strix).
Run it
# Local working tree
strix -n -t ./ --scan-mode standard --max-budget 15
# A GitHub repo directly
strix -n -t https://github.com/org/app --max-budget 15
# Monorepo: point at the service that matters, not the whole tree
strix -n -t ./services/checkout --max-budget 20
# Only what a branch changed (whole-repo review is wasteful on a large repo)
strix -n -t ./ --scope-mode diff --diff-base origin/main --max-budget 10
A local path is mounted into the sandbox writable, so the agents can modify it. Run against a clean checkout.
Two things sharply improve results:
- Add a running instance of the app.
-t ./ -t http://host.docker.internal:3000lets the agents confirm exploitability against live behavior instead of reasoning about it statically — this is the difference between "this looks unsafe" and a validated finding. If nothing is running, static-only findings should be described as unconfirmed. - Scope the review. Point at the risky subtree and say what matters:
Tenancy model, trust boundaries, and which inputs are attacker-controlled are things the agents cannot infer reliably — tell them.
strix -n -t ./services/api --max-budget 15 \ --instruction "Focus on the authorization layer in src/auth and every route under src/routes/admin. Multi-tenant app: tenant id comes from the JWT. Flag any query that filters by object id without also filtering by tenant."
Reviewing a pull request instead of the whole repo
For diff-scoped review of a branch or PR (and blocking merges on findings), use ci-security-scanning-with-strix — it covers diff scoping, PR comments, and SARIF upload to GitHub code scanning. The managed platform can also review PRs directly via API (managed-pentesting-with-strix).
Read the results
In strix_runs/<run>/: penetration_test_report.md (start here), vulnerabilities/*.md (one per finding, with PoC and remediation), vulnerabilities.json / .csv, findings.sarif (upload to code scanning), run.json.
Before reporting to the user, open each finding and check the PoC actually demonstrates impact. Report file and line alongside the exploit so the fix is obvious.
Exit 0 means nothing exploitable was proven in what was analyzed — not that the codebase is clean. Check run.json status and cost against --max-budget, and note which paths went unreviewed if the run was capped.
Complementary tooling
This is exploit-validated review, not an exhaustive inventory. Keep a dependency scanner (SCA) and secret scanning in place for complete coverage of known-CVE dependencies and committed credentials; use this for the logic, authorization, and injection bugs those tools structurally cannot find.
Fix and verify
Hand results to fix-security-vulnerabilities-with-strix: patch the root cause (the shared authorization helper, not the one route), then re-run Strix to prove the exploit no longer works.
FAQ
What does the find-security-vulnerabilities-in-code skill do?
Find security vulnerabilities in a codebase or repository with Strix — a white-box AI security review that reads your source, reasons about the actual data flow and authorization model, then exploits what it finds in a live sandbox so every reported issue has a working proof-of-concept instead of a noisy static-analysis alert. Covers injection, XSS, SSRF, broken access control and IDOR, insecure deserialization, secrets in code, unsafe dependencies, and business-logic flaws. Use when the user asks to security-scan, security-review, or audit their code, repo, or pull request for vulnerabilities.
How do I install find-security-vulnerabilities-in-code?
Run npx skills add https://github.com/usestrix/strix --skill find-security-vulnerabilities-in-code in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/find-security-vulnerabilities-in-code/ (personal) or .claude/skills/find-security-vulnerabilities-in-code/ (project).
Which AI agents can use find-security-vulnerabilities-in-code?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is find-security-vulnerabilities-in-code safe to install?
Security partners have reviewed it: Gen Agent Trust Hub passed; Socket flagged items to review; Snyk flagged items to review. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains find-security-vulnerabilities-in-code?
It is published by usestrix in usestrix/strix. It has 13,025 recorded installs.
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