CVE-2026-55795 PUBLISHED

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

Assigner: GitHub_M
Reserved: 17.06.2026 Published: 14.09.2026 Updated: 14.09.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	craftcms
Product	commerce
Versions	Version >= 4.0.0, < 4.11.2 is affected Version >= 5.0.0, < 5.6.5 is affected

References

Problem Types

CWE-307: Improper Restriction of Excessive Authentication Attempts CWE