CVE-2026-55795
Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass
- State
- Published
- Severity
- 6.9 Medium
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Reserved
- Jun 17, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | 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 | GitHub_M |
Weaknesses
- CWE-307 Improper Restriction of Excessive Authentication Attempts
Affected Products
| Product | Versions |
|---|---|
commercecraftcms |
|
References
- 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
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