{"id":"CVE-2026-55795","aliases":["EUVD-2026-77587","GHSA-h5gm-x9wr-vhcm"],"status":"published","title":"Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass","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.","severity":{"version":"4.0","score":6.9,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00512,"percentile":0.43971,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-307"],"published":"2026-06-19T21:15:26Z","modified":"2026-10-28T02:31:14Z","fixes":[{"ecosystem":"Packagist","package":"craftcms/commerce","fixed_in":["5.6.5","4.11.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"craftcms/commerce","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0"},{"last_affected":"5.6.4"},{"fixed":"5.6.5"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"craftcms/commerce","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"last_affected":"4.11.1"},{"fixed":"4.11.2"}]}]},{"source":"osv","ecosystem":"Packagist","package":"craftcms/commerce","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0"},{"fixed":"5.6.5"}]}],"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"]},{"source":"osv","ecosystem":"Packagist","package":"craftcms/commerce","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.11.2"}]}],"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"]}],"products":[{"vendor":"craftcms","product":"commerce"}],"references":[{"url":"https://github.com/craftcms/commerce/security/advisories/GHSA-h5gm-x9wr-vhcm","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/craftcms/commerce/commit/a7d365cc33dc4c60c543defb3458bcdb5749bc13","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/craftcms/commerce/commit/df22c4f9c4ea7fb7857d833f755e49ea6f9f5bb5","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/craftcms/commerce/releases/tag/4.11.2","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/craftcms/commerce/releases/tag/5.6.5","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/advisories/GHSA-h5gm-x9wr-vhcm"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55795.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55795","tags":["advisory"]},{"url":"https://github.com/craftcms/commerce","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-55795","title":"Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass","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.","status":"published","published":"2026-09-14T15:55:14Z","modified":"2026-09-14T20:06:54.939Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-307"],"updated_at":"2026-11-02T14:20:11.925815Z"}],"euvd":[{"id":"EUVD-2026-77587","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.","status":"published","published":"2026-09-14T15:55:14Z","modified":"2026-09-14T20:06:54Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"updated_at":"2026-11-02T17:28:19.383429Z"}],"ghsa":[{"id":"GHSA-h5gm-x9wr-vhcm","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\u003cimg width=\"864\" height=\"90\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/a5197f10-f1fd-4331-93f9-9479d0ceebba\" /\u003e\n\n\u003cimg width=\"881\" height=\"272\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/d9db963f-5d1f-4b00-a4b4-5f2dfe2b71dd\" /\u003e\n\n\u003cimg width=\"861\" height=\"271\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/f7842493-3bc0-4e99-956c-7266bab15703\" /\u003e\n\n### PoC\nComplete instructions, including specific configuration details, to reproduce the vulnerability.\n\n\u003cimg width=\"909\" height=\"171\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/cfc8c994-5e0c-48de-b728-464029beba0e\" /\u003e\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.","status":"published","published":"2026-06-19T21:15:26Z","modified":"2026-06-19T21:15:26Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"cwes":["CWE-307"],"updated_at":"2026-11-02T14:40:31.656952Z"}],"nvd":[{"id":"CVE-2026-55795","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.","status":"published","published":"2026-09-14T16:17:12.81Z","modified":"2026-09-30T17:51:56.193Z","cvss":[{"version":"4.0","score":6.9,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-307"],"updated_at":"2026-11-02T14:12:46.980627Z"}],"osv":[{"id":"CVE-2026-55795","title":"Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass","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.","status":"published","published":"2026-09-14T15:55:14Z","modified":"2026-10-28T02:31:14.245119478Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"cwes":["CWE-307"],"updated_at":"2026-11-02T15:45:11.609219Z"},{"id":"GHSA-h5gm-x9wr-vhcm","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\u003cimg width=\"864\" height=\"90\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/a5197f10-f1fd-4331-93f9-9479d0ceebba\" /\u003e\n\n\u003cimg width=\"881\" height=\"272\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/d9db963f-5d1f-4b00-a4b4-5f2dfe2b71dd\" /\u003e\n\n\u003cimg width=\"861\" height=\"271\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/f7842493-3bc0-4e99-956c-7266bab15703\" /\u003e\n\n### PoC\nComplete instructions, including specific configuration details, to reproduce the vulnerability.\n\n\u003cimg width=\"909\" height=\"171\" alt=\"resim\" src=\"https://github.com/user-attachments/assets/cfc8c994-5e0c-48de-b728-464029beba0e\" /\u003e\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.","status":"published","published":"2026-06-19T21:15:26Z","modified":"2026-09-10T03:50:49.693876213Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"cwes":["CWE-307"],"updated_at":"2026-11-02T15:46:48.546324Z"}]}}