What are common security mistakes in v0.dev apps?
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Short Answer
The mistakes we see repeatedly in v0.dev apps: xss via dangerouslysetinnerhtml; missing input validation; placeholder api calls. Each one is a specific failure mode of v0.dev's workflow — not generic programming mistakes.
Detailed Answer
The mistakes we actually see in v0.dev apps
These aren't hypothetical — they're what vas finds when it scans a v0.dev app for the first time. Listed in order of how often they appear:
1. XSS via dangerouslySetInnerHTML
*Why it happens:* AI may suggest React patterns that render unsanitized user content.
*Fix:* Search for dangerouslySetInnerHTML. Sanitize all dynamic HTML with DOMPurify.
2. Missing Input Validation
*Why it happens:* v0 generates UI but not server-side validation logic.
*Fix:* Add server-side validation for all form inputs. Never trust client-side only.
3. Placeholder API Calls
*Why it happens:* Generated code may include placeholder URLs or fake endpoints.
*Fix:* Review all fetch/API calls. Replace placeholders before deployment.
4. Client-Side Auth Patterns
*Why it happens:* UI-only auth flows that can be bypassed.
*Fix:* Implement real auth with NextAuth.js, Clerk, or Supabase Auth.
5. Outdated Dependencies
*Why it happens:* Suggested packages may have known vulnerabilities.
*Fix:* Run npm audit after installation. Update vulnerable packages.
Why these specifically show up in v0.dev (and not as much elsewhere)
v0.dev's workflow optimizes for speed — idea to deployed app in minutes. The mistakes above aren't character flaws, they're the predictable output of a speed-optimized workflow that doesn't enforce security gates. The fix is treating security gates as non-negotiable, not as "I'll get to it later."
Security Research & Statistics
of Lovable applications (170 out of 1,645) had exposed user data in the CVE-2025-48757 incident
Source: CVE-2025-48757 security advisory
average cost of a data breach in 2023
Source: IBM Cost of a Data Breach Report 2023
developers using vibe coding platforms like Lovable, Bolt, and Replit
Source: Combined platform statistics 2024-2025
Expert Perspectives
“There's a new kind of coding I call 'vibe coding', where you fully give in to the vibes, embrace exponentials, and forget that the code even exists.”
“It's not really coding - I just see stuff, say stuff, run stuff, and copy paste stuff, and it mostly works.”
Check Your v0.dev App's Security
vas scans for all the security issues mentioned above. Run a $5 Starter Scan for your full report with a copy-paste fix for every finding.
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How common are these mistakes in v0.dev apps — is this overstated?
Understated, if anything. The majority of v0.dev apps scanned for the first time have at least one of the high-likelihood mistakes above. "XSS via dangerouslySetInnerHTML" in particular is the default state of a new v0.dev app before any security work. Our sample skews toward apps whose owners care enough to scan — the base rate for never-scanned v0.dev apps is higher.
What are the actual consequences when these mistakes ship to production?
The consequence ladder: (a) data exposure — emails, passwords, PII, payment info readable by anyone; (b) account takeover — if auth is weak, legitimate accounts get hijacked; (c) third-party abuse — an exposed OpenAI or Stripe key gets drained of quota or money; (d) regulatory — GDPR/CCPA notification requirements trigger at ~first exposure; (e) reputational — "v0.dev app data breach" is a headline that doesn't age well. Each consequence compounds the next.
How do I avoid these mistakes when building with v0.dev?
Three non-negotiable habits: (1) Configure Row Level Security (RLS) policies at table/collection creation — before writing any feature code. (2) Treat any paste-a-key-into-code as a bug from the first keystroke, not "I'll move it to env vars later." (3) Run a vas scan before every production deploy — five minutes of scanning prevents hours-to-weeks of breach response. Specifically: Search for dangerouslySetInnerHTML. Sanitize all dynamic HTML with DOMPurify..
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