{"id":"CVE-2026-55795","state":"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.","publishedAt":"2026-09-14T15:55:14.000Z","updatedAt":"2026-09-14T20:06:54.939Z","severity":{"score":6.9,"label":"Medium","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["craftcms commerce"],"affected":[{"vendor":"craftcms","product":"commerce","versions":[{"version":">= 4.0.0, < 4.11.2","status":"affected"},{"version":">= 5.0.0, < 5.6.5","status":"affected"}]}],"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"],"weaknesses":["CWE-307"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55795.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55795","state":"PUBLISHED","datePublished":"2026-09-14T15:55:14.000Z","dateUpdated":"2026-09-14T20:06:54.939Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-17T14:40:28.380Z"},"containers":{"cna":{"title":"Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass","descriptions":[{"lang":"en","value":"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":[{"vendor":"craftcms","product":"commerce","versions":[{"version":">= 4.0.0, < 4.11.2","status":"affected"},{"version":">= 5.0.0, < 5.6.5","status":"affected"}]}],"references":[{"url":"https://github.com/craftcms/commerce/security/advisories/GHSA-h5gm-x9wr-vhcm","name":"https://github.com/craftcms/commerce/security/advisories/GHSA-h5gm-x9wr-vhcm","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/craftcms/commerce/commit/a7d365cc33dc4c60c543defb3458bcdb5749bc13","name":"https://github.com/craftcms/commerce/commit/a7d365cc33dc4c60c543defb3458bcdb5749bc13","tags":["x_refsource_MISC"]},{"url":"https://github.com/craftcms/commerce/commit/df22c4f9c4ea7fb7857d833f755e49ea6f9f5bb5","name":"https://github.com/craftcms/commerce/commit/df22c4f9c4ea7fb7857d833f755e49ea6f9f5bb5","tags":["x_refsource_MISC"]},{"url":"https://github.com/craftcms/commerce/releases/tag/4.11.2","name":"https://github.com/craftcms/commerce/releases/tag/4.11.2","tags":["x_refsource_MISC"]},{"url":"https://github.com/craftcms/commerce/releases/tag/5.6.5","name":"https://github.com/craftcms/commerce/releases/tag/5.6.5","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-307","lang":"en","description":"CWE-307: Improper Restriction of Excessive Authentication Attempts","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-14T15:55:14.000Z"},"source":{"advisory":"GHSA-h5gm-x9wr-vhcm","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-14T19:22:16.524924Z","id":"CVE-2026-55795","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-14T20:06:54.939Z"}}]}}}