{"id":"CVE-2026-16621","state":"PUBLISHED","title":"Payment Gateway for PayPal on WooCommerce < 9.2.1 - Unauthenticated Payment Bypass via PayPal Advanced Return Handler","description":"The Payment Gateway for PayPal on WooCommerce WordPress plugin before 9.2.1 does not verify that payment actually succeeded before completing an order in its PayPal return handler: it reads attacker-controlled parameters, performs no amount comparison and no order-ownership check, and completes the order even when the server-side gateway verification fails, allowing an unauthenticated attacker to mark arbitrary orders as paid without paying.","publishedAt":"2026-08-12T11:23:59.378Z","updatedAt":"2026-08-12T12:14:24.803Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","source":"WPScan"},"assigner":"WPScan","products":["Unknown Payment Gateway for PayPal on WooCommerce"],"affected":[{"vendor":"Unknown","product":"Payment Gateway for PayPal on WooCommerce","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"9.2.1","versionType":"semver"}],"collectionURL":"https://wordpress.org/plugins"}],"references":["https://wpscan.com/vulnerability/76c4cff2-1166-45fe-9517-5eda2d24c35d/"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:00.674Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/16xxx/CVE-2026-16621.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-16621","state":"PUBLISHED","datePublished":"2026-08-12T11:23:59.378Z","dateUpdated":"2026-08-12T12:14:24.803Z","assignerShortName":"WPScan","assignerOrgId":"1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81","dateReserved":"2026-07-22T14:51:38.254Z"},"containers":{"cna":{"title":"Payment Gateway for PayPal on WooCommerce < 9.2.1 - Unauthenticated Payment Bypass via PayPal Advanced Return Handler","descriptions":[{"lang":"en","value":"The Payment Gateway for PayPal on WooCommerce WordPress plugin before 9.2.1 does not verify that payment actually succeeded before completing an order in its PayPal return handler: it reads attacker-controlled parameters, performs no amount comparison and no order-ownership check, and completes the order even when the server-side gateway verification fails, allowing an unauthenticated attacker to mark arbitrary orders as paid without paying."}],"affected":[{"vendor":"Unknown","product":"Payment Gateway for PayPal on WooCommerce","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"9.2.1","versionType":"semver"}],"collectionURL":"https://wordpress.org/plugins"}],"references":[{"url":"https://wpscan.com/vulnerability/76c4cff2-1166-45fe-9517-5eda2d24c35d/","tags":["exploit","vdb-entry","technical-description"]}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","baseScore":5.3,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"description":"CWE-345 Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"WPScan","orgId":"1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81","dateUpdated":"2026-08-12T11:23:59.378Z"},"credits":[{"lang":"en","value":"Muni Nitish Kumar Yaddala","type":"finder"},{"lang":"en","value":"WPScan","type":"coordinator"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"WPScan CVE Generator"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-12T12:14:12.062302Z","id":"CVE-2026-16621","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":"2026-08-12T12:14:24.803Z"}}]}}}