CVE-2026-55795: Craft CMS Commerce

Medium severity, CVSS 6.9. EPSS: 0.5% chance of exploitation in the next 30 days.

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 products

• Craft CMS Commerce: from 4.0.0, before 4.11.2 (fixed in 4.11.2); from 5.0.0, before 5.6.5 (fixed in 5.6.5)

Published 2026-09-14. Last modified 2026-09-30.