# Claude Code Lands in the Terminal: Is Finding Vulnerabilities Child's Play Now?

> Claude Code is out and things are heating up. Can this new AI tool actually catch security vulnerabilities, or is it just making noise?

- Author: Sedat Özdemir (Sr. Expert Pentest & Vulnerability Management Engineer)
- Date: 2026-02-23
- Category: offensive-ai · Tags: ai-security, anthropic, devsecops, red-teaming, vulnerability-detection
- URL: https://sedatozdemir.com.tr/en/blog/claude-code-terminale-indi-kodun-icindeki-aciklari-bulmak-artik-cocuk-oyuncagi-mi

Late last night I was sitting at the terminal, sipping coffee and poking at Claude Code, Anthropic's latest release. When it was first announced, my honest reaction was "another wrapper tool?" Once I got into it, though, and especially once I saw what it can do on the security side, I thought: okay, something is actually changing.

For years we've been getting lost in thousands of lines of code during pentests and red team operations. We use static analysis (SAST) tools, but let's be honest: cleaning up the thousands of false positives they produce is sometimes more exhausting than doing the analysis by hand. Claude Code settles into the terminal and talks to you like a colleague, which takes that process somewhere else entirely.

### A new watchman in the terminal

Claude Code is different from the classic AI chat interfaces you know. It works directly on your file system, looks at your git history, runs your tests and even fixes your code. Recently I simulated a situation I'd run into on a project: an API endpoint was missing an authorization check (broken object level authorization, BOLA). Classic SAST tools usually miss this, because understanding a logic flaw requires knowing the overall flow of the application.

I asked Claude, "Do you see anything risky from a security standpoint in these endpoints?" It first went into the `routes/` folder, then examined the logic under `controllers/`, and said: "Look, you take an `id` from the user here, but you never check whether that `id` belongs to that user. That's a security risk." That was my "wow" moment.

Let's walk through an example. Imagine you have a simple but risky piece of Express.js code like this:

```javascript
// Risky code example
app.get('/api/user/invoice/:id', async (req, res) => {
  const invoice = await Invoice.findOne({ id: req.params.id });
  if (invoice) {
    res.json(invoice);
  } else {
    res.status(404).send('Invoice not found');
  }
});
```

There's a big IDOR/BOLA risk here. Any user can reach someone else's invoice just by changing the invoice `id`. When you point Claude Code at this, it doesn't stop at "there's a bug"; it proposes a patch right away:

```javascript
// The safer version Claude Code suggested
app.get('/api/user/invoice/:id', async (req, res) => {
  // Make sure the user can only access their own invoices
  const invoice = await Invoice.findOne({ 
    id: req.params.id, 
    userId: req.user.id // User ID taken from the token
  });
  
  if (invoice) {
    res.json(invoice);
  } else {
    res.status(404).send('You are not authorized or the invoice does not exist');
  }
});
```

### Speed or security? Both

There's a situation I run into a lot. When I tell developer friends "let's add security tests to the pipeline," they usually push back with "the build takes too long already, and it throws too many false alarms anyway." They have a point. With agentic tools like Claude Code, which can make decisions on their own, the picture starts to change.

It doesn't just read the code; it runs `npm test` or `pytest` on your behalf to check whether its fix broke existing features. That takes us one step closer to the "self-healing systems" we've been dreaming about in DevSecOps.

There's one thing to watch out for, though: you shouldn't trust these tools blindly. I think the biggest risk is falling into the "the AI handled it, so it's secure" trap. In one scenario I tried recently, Claude completely misread a fairly complex race condition. So we, the people who actually do this work, are still needed. Claude can be your assistant, but it can't be the one making the call.

### Claude Code through a red team lens

If you think like an attacker or a red teamer, Claude Code is really an "attack accelerator." Imagine you've somehow gained access to the target's source code, through an intrusion or a supply chain attack. Code you used to spend hours reading, you can now have analyzed in minutes by telling Claude, "Find the most critical vulnerabilities here and prepare an exploit scenario for me."

It's incredibly fast at spotting `hardcoded credentials` and weak cryptographic algorithms. Catching something like this takes it milliseconds:

```python
# Please don't do things like this :)
import hashlib

def hash_password(password):
    # Claude will warn you the moment it sees this: "MD5, really?"
    return hashlib.md5(password.encode()).hexdigest()
```

If you ask me, Claude Code's strongest side is its awareness of context. Classic tools look at a single line. Claude can hold the whole project in view and say "this variable comes from here, goes into that function, and gets written to the database there without being sanitized." That's what we call taint analysis, supercharged with AI.

### So is it a silver bullet?

Of course, as with every new technology, there's a wind of hype here too. Claude Code isn't a magic wand that solves everything. There's still a risk of hallucination; it sometimes treats a library that doesn't exist as if it does and gives security advice based on it.

Then there's privacy. If you're working on a corporate project, how sensible is it to send your code to Anthropic's servers? Reviewing your company's policies is a must. Anthropic does say this data isn't used for training, but in security we live by "trust but verify."

I think the most sensible thing to do right now is to keep Claude Code next to you as a pair programmer. While you write code, saying "hey Claude, did I leave a door open in this function? Can you take a look?" will save you a lot of time.

### A closing word

Technology is moving very fast. One day most cyberattacks may be carried out by AI agents, and defense may be handled by AI agents too. Claude Code is one of the most concrete examples of that future we have today.

If you're a developer or on the security side, you'll have to learn to use tools like this; you don't want to miss the train. But don't forget that the best security tool is still your own brain. Claude is like a very talented intern who helps you work faster and more focused.

What do you think? Have you had a chance to try Claude Code? Would you trust it on your own projects enough to hit "push"? I'm curious; maybe one day we'll talk about it at length.

See you, and happy secure coding!