{"id":"CVE-2026-121636","aliases":["EUVD-2026-117974","GHSA-qm8v-r38g-4hjq"],"status":"published","title":"Quick Event Manager 9.9.5 - 9.18 - Unauthenticated PayPal IPN Verification Bypass via the 'debug' Parameter","description":"The Quick Event Manager WordPress plugin before 9.19 does not verify the authenticity of PayPal payment notifications before marking event registrations as paid, which could allow unauthenticated attackers to mark registrations as paid without making a payment.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00114,"percentile":0.0152,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-345"],"published":"2026-11-06T07:30:57Z","modified":"2026-11-06T11:50:26Z","products":[{"vendor":"fullworks","product":"quick event manager"},{"vendor":"unknown","product":"quick event manager"}],"references":[{"url":"https://wpscan.com/vulnerability/04b181e1-639c-476f-b66b-2a073bf36829/","tags":["exploit","vdb-entry","technical-description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121636"},{"url":"https://wpscan.com/vulnerability/04b181e1-639c-476f-b66b-2a073bf36829"},{"url":"https://github.com/advisories/GHSA-qm8v-r38g-4hjq"}],"sources":{"cve":[{"id":"CVE-2026-121636","title":"Quick Event Manager 9.9.5 - 9.18 - Unauthenticated PayPal IPN Verification Bypass via the 'debug' Parameter","description":"The Quick Event Manager WordPress plugin before 9.19 does not verify the authenticity of PayPal payment notifications before marking event registrations as paid, which could allow unauthenticated attackers to mark registrations as paid without making a payment.","status":"published","published":"2026-11-06T07:30:57.215Z","modified":"2026-11-06T11:50:26.062Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-345"],"updated_at":"2026-11-06T12:28:03.779112Z"}],"euvd":[{"id":"EUVD-2026-117974","description":"The Quick Event Manager WordPress plugin before 9.19 does not verify the authenticity of PayPal payment notifications before marking event registrations as paid, which could allow unauthenticated attackers to mark registrations as paid without making a payment.","status":"published","published":"2026-11-06T07:30:57Z","modified":"2026-11-06T11:50:26Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-06T13:04:55.758116Z"}],"ghsa":[{"id":"GHSA-qm8v-r38g-4hjq","title":"The Quick Event Manager WordPress plugin before 9.19 does not verify the authenticity of PayPal...","description":"The Quick Event Manager WordPress plugin before 9.19 does not verify the authenticity of PayPal payment notifications before marking event registrations as paid, which could allow unauthenticated attackers to mark registrations as paid without making a payment.","status":"published","published":"2026-11-06T09:31:31Z","modified":"2026-11-06T12:30:36Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-345"],"updated_at":"2026-11-06T13:00:04.317934Z"}],"nvd":[{"id":"CVE-2026-121636","description":"The Quick Event Manager WordPress plugin before 9.19 does not verify the authenticity of PayPal payment notifications before marking event registrations as paid, which could allow unauthenticated attackers to mark registrations as paid without making a payment.","status":"published","published":"2026-11-06T08:17:20.103Z","modified":"2026-11-06T20:09:13.78Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-345"],"updated_at":"2026-11-06T22:02:17.053381Z"}]}}