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

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-30
• Weakness: CWE-307

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.

Affected products

• craftcms commerce: from 4.0.0, < 4.11.2; from 5.0.0, < 5.6.5

References

• 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
• https://github.com/craftcms/commerce/security/advisories/GHSA-h5gm-x9wr-vhcm

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