medium6.9
CVE-2026-55795
Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass
Impact
Craft Commerce is an ecommerce platform for Craft CMS. From 4.0.0 until 4.11.2 and 5.6.5, CartController in src/controllers/CartController.php activates its RateLimiter only when the number POST or GET parameter is supplied. An unauthenticated attacker can submit couponCode values to actionUpdateCart for the session-based cart while omitting number, preventing creation of the IP rate-limit identity and allowing unlimited automated coupon-code guessing and enumeration. This issue is fixed in versions 4.11.2 and 5.6.5.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | craftcms/commerce | >= 5.0.0, <= 5.6.4 | 5.6.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-h5gm-x9wr-vhcm
- https://github.com/craftcms/commerce/security/advisories/GHSA-h5gm-x9wr-vhcm
- https://github.com/craftcms/commerce/commit/df22c4f9c4ea7fb7857d833f755e49ea6f9f5bb5
- https://github.com/craftcms/commerce/commit/a7d365cc33dc4c60c543defb3458bcdb5749bc13
- https://github.com/craftcms/commerce/releases/tag/4.11.2
- https://github.com/craftcms/commerce/releases/tag/5.6.5