GHSA-h5gm-x9wr-vhcm Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass

• Packagist craftcms/commerce: >= 5.0.0, < 5.6.5 → fixed in 5.6.5 • Packagist craftcms/commerce: >= 4.0.0, < 4.11.2 → fixed in 4.11.2

Summary The CartController defines a RateLimiter behavior that is only activated when the 'number' POST/GET parameter is explicitly provided. Details When an attacker submits coupon codes against the session-based cart (without passing a 'number' parameter), no rate limiting is applied. This allows unlimited attempts to guess coupon codes. Vulnerable Code PoC Complete instructions, including specific configuration details, to reproduce the vulnerability. Impact An attacker can enumerate all coupon codes through automated requests. Remediation Apply rate limiting unconditionally on actionUpdateCart regardless of whether 'number' is present.