CVE-2026-55795Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass

Description

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/craftcms/commerce/security/advisories/GHSA-h5gm-x9wr-vhcm
• https://github.com/craftcms/commerce/commit/a7d365cc33dc4c60c543defb3458bcdb5749bc13
• https://github.com/craftcms/commerce/commit/df22c4f9c4ea7fb7857d833f755e49ea6f9f5bb5
• https://github.com/craftcms/commerce/releases/tag/4.11.2
• https://github.com/craftcms/commerce/releases/tag/5.6.5