Medium severity · published Sep 14, 2026
CVE-2026-55795
Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass
6.9
CVSS
0.5%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
commerce · craftcms
>= 4.0.0, < 4.11.2; >= 5.0.0, < 5.6.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55795
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55795
github.com
https://github.com/craftcms/commerce/commit/a7d365cc33dc4c60c543defb3458bcdb5749bc13
github.com
https://github.com/craftcms/commerce/commit/df22c4f9c4ea7fb7857d833f755e49ea6f9f5bb5
github.com
https://github.com/craftcms/commerce/releases/tag/4.11.2
github.com
https://github.com/craftcms/commerce/releases/tag/5.6.5
github.com
https://github.com/craftcms/commerce/security/advisories/GHSA-h5gm-x9wr-vhcm
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