{"id":"GHSA-h5gm-x9wr-vhcm","aliases":["CVE-2026-55795"],"title":"Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass","description":"### Summary\n\nThe CartController defines a RateLimiter behavior that is only activated when the 'number' POST/GET parameter is explicitly provided.\n\n### Details\n\nWhen an attacker submits coupon codes against the session-based cart (without passing a 'number' parameter), no rate limiting is applied. This allows unlimited attempts to guess coupon codes.\n\n**Vulnerable Code**\n<img width=\"864\" height=\"90\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/a5197f10-f1fd-4331-93f9-9479d0ceebba\" />\n\n<img width=\"881\" height=\"272\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/d9db963f-5d1f-4b00-a4b4-5f2dfe2b71dd\" />\n\n<img width=\"861\" height=\"271\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/f7842493-3bc0-4e99-956c-7266bab15703\" />\n\n### PoC\nComplete instructions, including specific configuration details, to reproduce the vulnerability.\n\n<img width=\"909\" height=\"171\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/cfc8c994-5e0c-48de-b728-464029beba0e\" />\n\n### Impact\nAn attacker can enumerate all coupon codes through automated requests.\n\n**Remediation**\nApply rate limiting unconditionally on actionUpdateCart regardless of whether 'number' is present.","severity":"medium","score":6.9,"published":"2026-06-19T21:15:26.000Z","modified":"2026-09-10T03:50:49.693Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"craftcms/commerce","ranges":[{"events":[{"introduced":"5.0.0"},{"fixed":"5.6.5"}],"type":"ECOSYSTEM"}],"versions":["5.0.0","5.0.1","5.0.10","5.0.10.1","5.0.11","5.0.11.1","5.0.12","5.0.12.1","5.0.12.2","5.0.13","5.0.14","5.0.15","5.0.16","5.0.16.1","5.0.16.2","5.0.17","5.0.18","5.0.19","5.0.2","5.0.3","5.0.4","5.0.5","5.0.6","5.0.7","5.0.8","5.0.9","5.1.0","5.1.0-beta.1","5.1.0-beta.2","5.1.0-beta.3","5.1.0.1","5.1.1","5.1.2","5.1.3","5.1.4","5.2.0","5.2.1","5.2.10","5.2.11","5.2.12","5.2.12.1","5.2.2","5.2.2.1","5.2.3","5.2.4","5.2.5","5.2.6","5.2.7","5.2.8","5.2.9","5.2.9.1","5.3.0","5.3.0.1","5.3.0.2","5.3.1","5.3.10","5.3.11","5.3.12","5.3.13","5.3.2","5.3.2.1","5.3.2.2","5.3.3","5.3.4","5.3.5","5.3.6","5.3.7","5.3.8","5.3.9","5.4.0","5.4.1","5.4.1.1","5.4.10","5.4.2","5.4.3","5.4.4","5.4.5","5.4.5.1","5.4.6","5.4.7","5.4.7.1","5.4.8","5.4.9","5.5.0","5.5.0.1","5.5.1","5.5.2","5.5.3","5.5.4","5.6.0","5.6.1","5.6.1.1","5.6.2","5.6.3","5.6.4"],"fixed":["5.6.5"]},{"ecosystem":"Packagist","name":"craftcms/commerce","ranges":[{"events":[{"introduced":"4.0.0"},{"fixed":"4.11.2"}],"type":"ECOSYSTEM"}],"versions":["4.0.0","4.0.1","4.0.2","4.0.3","4.0.4","4.1.0","4.1.1","4.1.2","4.1.3","4.10.0","4.10.1","4.10.2","4.11.0","4.11.0.1","4.11.1","4.2.0","4.2.1","4.2.10","4.2.11","4.2.2","4.2.3","4.2.4","4.2.5","4.2.5.1","4.2.6","4.2.7","4.2.8","4.2.9","4.3.0","4.3.1","4.3.2","4.3.3","4.4.0","4.4.1","4.4.1.1","4.5.0","4.5.1","4.5.1.1","4.5.2","4.5.3","4.5.4","4.6.0","4.6.1","4.6.10","4.6.11","4.6.12","4.6.13","4.6.14","4.6.2","4.6.3.1","4.6.4","4.6.5","4.6.6","4.6.7","4.6.8","4.6.9","4.7.0","4.7.1","4.7.2","4.7.3","4.8.0","4.8.0.1","4.8.1","4.8.1.1","4.8.1.2","4.8.2","4.8.3","4.8.4","4.9.0","4.9.1","4.9.2","4.9.3","4.9.4"],"fixed":["4.11.2"]}],"references":["https://github.com/craftcms/commerce/security/advisories/GHSA-h5gm-x9wr-vhcm","https://github.com/craftcms/commerce/commit/df22c4f9c4ea7fb7857d833f755e49ea6f9f5bb5","https://github.com/craftcms/commerce"],"sources":[{"name":"OSV","id":"GHSA-h5gm-x9wr-vhcm","modified":"2026-09-10T03:50:49.693876213Z","url":"https://osv.dev/vulnerability/GHSA-h5gm-x9wr-vhcm"}],"assessments":[{"source":"OSV","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","score":6.9}]}