GHSA-6f65-4fv2-wwch Vendure vulnerable to timing attack that enables user enumeration in NativeAuthenticationStrategy

• npm @vendure/core: < 3.5.3 → fixed in 3.5.3

Summary The `NativeAuthenticationStrategy.authenticate()` method is vulnerable to a timing attack that allows attackers to enumerate valid usernames (email addresses). Details In `packages/core/src/config/auth/native-authentication-strategy.ts`, the authenticate method returns immediately if a user is not found: ```typescript const user = await this.userService.getUserByEmailAddress(ctx, data.username); if (!user) { return false; // Instant return (~1-5ms) } const passwordMatch = await this.verifyUserPassword(ctx, user.id, data.password); // Password check takes ~200-400ms with bcrypt (12 rounds) ``` The significant timing difference (~200-400ms for bcrypt vs ~1-5ms for DB miss) allows attackers to reliably distinguish between existing and non-existing accounts. Impact • Attackers can enumerate valid user accounts • Enables targeted brute-force or phishing attacks • Information disclosure (account existence) Recommended Fix Perform a dummy bcrypt check when user is not found to ensure consistent response times.